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2boys 2d 2d_(artwork) accurate_art_style alley anthro burgerpants clothed_sex digital_media_(artwork) felid feline femboy femboy_on_male furry hair humanoid humanoid_on_anthro humanoid_robot male/male male_on_male male_only mettapants mettaton mettaton_ex penetration pixel_art robot robot_boy robot_humanoid seme_mettaton semi_public serfuzzy top_mettaton undertale undertale_(series) video_game_character video_games yaoi
2boys 2d 2d_(artwork) accurate_art_style alley anthro burgerpants clothed_sex digital_media_(artwork) felid feline femboy femboy_on_male furry hair humanoid humanoid_on_anthro humanoid_robot male/male male_on_male male_only mettapants mettaton mettaton_ex penetration pixel_art robot robot_boy robot_humanoid seme_mettaton semi_public serfuzzy top_mettaton undertale undertale_(series) video_game_character video_games yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton bigger_male biting_lip black_and_white black_hair blue_jacket bottom_sans clothed digital_media_(artwork) ectotongue fellatio genitals hair hair_over_one_eye hand_on_another's_head hand_on_head heart humanoid humanoid_robot jacket ladybumtickler larger_male licking licking_penis line_art lineart male male/male male_only mettasans mettaton mettaton_ex monochrome monster oral penis robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton sex size_difference skeleton smaller_male sniggysmut third-party_source top_mettaton tumblr_username uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton bigger_male biting_lip black_and_white black_hair blue_jacket bottom_sans clothed digital_media_(artwork) ectotongue fellatio genitals hair hair_over_one_eye hand_on_another's_head hand_on_head heart humanoid humanoid_robot jacket ladybumtickler larger_male licking licking_penis line_art lineart male male/male male_only mettasans mettaton mettaton_ex monochrome monster oral penis robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton sex size_difference skeleton smaller_male sniggysmut third-party_source top_mettaton tumblr_username uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2d 2d_(artwork) animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans clothed crazy_eyes crazy_smile digital_media_(artwork) duo english_text hair hair_over_one_eye humanoid humanoid_robot mettasans mettaton mettaton_ex monster onomatopoeia punishment robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smirk spanking spanking_ass spanking_butt sweat text top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games white_background
2d 2d_(artwork) animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans clothed crazy_eyes crazy_smile digital_media_(artwork) duo english_text hair hair_over_one_eye humanoid humanoid_robot mettasans mettaton mettaton_ex monster onomatopoeia punishment robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smirk spanking spanking_ass spanking_butt sweat text top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games white_background
... 2d 2d_(artwork) animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans clothed digital_media_(artwork) duo english_text glowing_eye hair hair_over_one_eye humanoid humanoid_robot imminent_spanking mettasans mettaton mettaton_ex monster punishment robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smirk text top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games white_background
... 2d 2d_(artwork) animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans clothed digital_media_(artwork) duo english_text glowing_eye hair hair_over_one_eye humanoid humanoid_robot imminent_spanking mettasans mettaton mettaton_ex monster punishment robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smirk text top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games white_background
2d 2d_(artwork) animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans clothed digital_media_(artwork) duo english_text hair hair_over_one_eye humanoid humanoid_robot imminent_spanking mettasans mettaton mettaton_ex monster punishment robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom text top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games white_background
2d 2d_(artwork) animated_skeleton apron big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bottom_sans clothed digital_media_(artwork) duo english_text hair hair_over_one_eye humanoid humanoid_robot imminent_spanking mettasans mettaton mettaton_ex monster punishment robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom text top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games white_background
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bottom_sans digital_media_(artwork) hair hoodie humanoid humanoid_robot larger_male male male/male male_only maledom mettasans mettaton mettaton_ex monster penis robot robot_boy robot_humanoid robotic_penis sans sans_(undertale) seme_mettaton skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom top_mettaton uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games wearing_others_clothes yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bottom_sans digital_media_(artwork) hair hoodie humanoid humanoid_robot larger_male male male/male male_only maledom mettasans mettaton mettaton_ex monster penis robot robot_boy robot_humanoid robotic_penis sans sans_(undertale) seme_mettaton skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom top_mettaton uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games wearing_others_clothes yaoi
2010s 2015 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_eye blue_tongue boots bottom_sans box digital_media_(artwork) dominant dominant_male domination english_text footwear glowing_eyes hair hair_over_one_eye high_heel_boots humanoid humanoid_robot larger_male licking licking_leg male male/male male_only maledom malesub mettasans mettaton mettaton_ex monster nude nude_male penis pink_boots pink_eyes pink_glans pink_high_heel_boots pink_tongue robot robot_boy robot_humanoid robotic_penis sans sans_(undertale) seme_mettaton shoes simple_background skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom solid_color_background submissive submissive_male text tongue top_mettaton uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
2010s 2015 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_eye blue_tongue boots bottom_sans box digital_media_(artwork) dominant dominant_male domination english_text footwear glowing_eyes hair hair_over_one_eye high_heel_boots humanoid humanoid_robot larger_male licking licking_leg male male/male male_only maledom malesub mettasans mettaton mettaton_ex monster nude nude_male penis pink_boots pink_eyes pink_glans pink_high_heel_boots pink_tongue robot robot_boy robot_humanoid robotic_penis sans sans_(undertale) seme_mettaton shoes simple_background skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom solid_color_background submissive submissive_male text tongue top_mettaton uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
2boys 2d 2d_(artwork) 2males animated_skeleton arm_support artist_request blue_blush blue_penis blush bottom_sans clothed cute_penis digital_media_(artwork) ectopenis english_text gay grey_background groping hair hooded_jacket hoodie humanoid humanoid_robot jacket leg_between_thighs looking_away male male/male male_only mettasans mettaton mettaton_ex monochrome monster partially_colored penis penis_through_fly robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton shirt_lift shirt_pulled_up shirt_up simple_background skeleton small_penis solid_color_background sweat text text_bubble top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2boys 2d 2d_(artwork) 2males animated_skeleton arm_support artist_request blue_blush blue_penis blush bottom_sans clothed cute_penis digital_media_(artwork) ectopenis english_text gay grey_background groping hair hooded_jacket hoodie humanoid humanoid_robot jacket leg_between_thighs looking_away male male/male male_only mettasans mettaton mettaton_ex monochrome monster partially_colored penis penis_through_fly robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton shirt_lift shirt_pulled_up shirt_up simple_background skeleton small_penis solid_color_background sweat text text_bubble top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
1boy 1boy1girl 1girl 2d 2d_(artwork) 3_toes 4_fingers 5_fingers alphys anthro anthro_penetrated anus ass bigger_male black_background boots completely_nude completely_nude_female dark_background digital_media_(artwork) dinosaur dinosaur_girl female_anthro female_penetrated filthygum footwear genitals hair hetero high_heel_boots humanoid humanoid_on_anthro humanoid_penetrating humanoid_penetrating_anthro humanoid_robot larger_male larger_penetrating larger_penetrating_smaller lizard lizard_girl male male/female male_humanoid male_on_female male_penetrating male_penetrating_female mastery_position mettaphys mettaton mettaton_ex monster monster_girl nude nude_anthro nude_female open_mouth penetration penis penis_in_pussy pink_boots pink_high_heel_boots pink_tongue pussy reptile reptile_girl robot robot_boy robot_humanoid robotic_penis scalie scalie_female seme_mettaton sex shoes simple_background simple_shading smaller_female smaller_penetrated straight tail tears tears_of_pleasure text third-party_source tongue top_mettaton undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_game_character video_games yellow_body yellow_skin
1boy 1boy1girl 1girl 2d 2d_(artwork) 3_toes 4_fingers 5_fingers alphys anthro anthro_penetrated anus ass bigger_male black_background boots completely_nude completely_nude_female dark_background digital_media_(artwork) dinosaur dinosaur_girl female_anthro female_penetrated filthygum footwear genitals hair hetero high_heel_boots humanoid humanoid_on_anthro humanoid_penetrating humanoid_penetrating_anthro humanoid_robot larger_male larger_penetrating larger_penetrating_smaller lizard lizard_girl male male/female male_humanoid male_on_female male_penetrating male_penetrating_female mastery_position mettaphys mettaton mettaton_ex monster monster_girl nude nude_anthro nude_female open_mouth penetration penis penis_in_pussy pink_boots pink_high_heel_boots pink_tongue pussy reptile reptile_girl robot robot_boy robot_humanoid robotic_penis scalie scalie_female seme_mettaton sex shoes simple_background simple_shading smaller_female smaller_penetrated straight tail tears tears_of_pleasure text third-party_source tongue top_mettaton undertale undertale_(series) vaginal vaginal_penetration vaginal_sex video_game_character video_games yellow_body yellow_skin
1:1 1:1_aspect_ratio 2010s 2016 2boys 2d 2d_(artwork) animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male black_background black_hair blue_hoodie blue_jacket blue_tongue bottom_on_top bottom_sans clothed dark_background digital_media_(artwork) fel-fisk glowing hair hooded_jacket hoodie humanoid humanoid_robot jacket larger_male licking male male/male male_only mettasans mettaton mettaton_ex monster monster_boy one_eye_closed partially_clothed partially_nude pink_eyes pink_slippers pink_tongue robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton sinisk skeleton slippers small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom soul soul_sex sweat tongue tongue_out top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2016 2boys 2d 2d_(artwork) animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male black_background black_hair blue_hoodie blue_jacket blue_tongue bottom_on_top bottom_sans clothed dark_background digital_media_(artwork) fel-fisk glowing hair hooded_jacket hoodie humanoid humanoid_robot jacket larger_male licking male male/male male_only mettasans mettaton mettaton_ex monster monster_boy one_eye_closed partially_clothed partially_nude pink_eyes pink_slippers pink_tongue robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton sinisk skeleton slippers small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom soul soul_sex sweat tongue tongue_out top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2016 2boys 2d 2d_(artwork) anal animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller bottom_sans dark_background digital_media_(artwork) glowing hair hornyraptor humanoid humanoid_robot larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating mettasans mettaton mettaton_ex missionary_position penetration robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom thrusting top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2016 2boys 2d 2d_(artwork) anal animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller bottom_sans dark_background digital_media_(artwork) glowing hair hornyraptor humanoid humanoid_robot larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating mettasans mettaton mettaton_ex missionary_position penetration robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom thrusting top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2015 2boys 2d animated_skeleton artist_name bigger_dom bigger_dom_smaller_sub bigger_male blue_penis boots bottom_sans calciumchan clothed digital_media dominant dominant_male drooling duo ectopenis footwear fully_clothed high_heel_boots humanoid humanoid_robot kneel larger_male male male/male male_only maledom malesub mettasans mettaton mettaton_ex pee peeing peeing_on_another peeing_on_face penis pink_boots pink_high_heel_boots restrained robot robot_boy robot_humanoid sans_(undertale) seme_mettaton shoes skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom solo_focus submissive submissive_male third-party_source tied_up top_mettaton undead undertale undertale_(series) unseen_male_face urinating urinating_male urination video_game_character video_games watersports white_background yaoi
2015 2boys 2d animated_skeleton artist_name bigger_dom bigger_dom_smaller_sub bigger_male blue_penis boots bottom_sans calciumchan clothed digital_media dominant dominant_male drooling duo ectopenis footwear fully_clothed high_heel_boots humanoid humanoid_robot kneel larger_male male male/male male_only maledom malesub mettasans mettaton mettaton_ex pee peeing peeing_on_another peeing_on_face penis pink_boots pink_high_heel_boots restrained robot robot_boy robot_humanoid sans_(undertale) seme_mettaton shoes skeleton small_sub small_sub_big_dom smaller_male smaller_sub smaller_sub_bigger_dom solo_focus submissive submissive_male third-party_source tied_up top_mettaton undead undertale undertale_(series) unseen_male_face urinating urinating_male urination video_game_character video_games watersports white_background yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton black_hair blue_eyes boots bottom_sans bound_wrists clothed collar collar_and_leash digital_media_(artwork) hair heart hoodie humanoid humanoid_robot ifuckboxppl leash leash_and_collar leash_pull licking_lips male male/male male_only mettasans mettaton mettaton_ex pink_boots robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton simple_background skeleton straddling top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton black_hair blue_eyes boots bottom_sans bound_wrists clothed collar collar_and_leash digital_media_(artwork) hair heart hoodie humanoid humanoid_robot ifuckboxppl leash leash_and_collar leash_pull licking_lips male male/male male_only mettasans mettaton mettaton_ex pink_boots robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton simple_background skeleton straddling top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub blindfold blindfolded blue_tongue bottom_sans bottomless_female cussing digital_media_(artwork) drooling duo english_text from_behind groping hair hair_over_one_eye hand_in_pants humanoid humanoid_robot implied_handjob male male/male male_only mettasans mettaton mettaton_ex moaning profanity robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton shirt_lift shirt_up skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom swearing text tinyskeletonfucker tongue tongue_out top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub blindfold blindfolded blue_tongue bottom_sans bottomless_female cussing digital_media_(artwork) drooling duo english_text from_behind groping hair hair_over_one_eye hand_in_pants humanoid humanoid_robot implied_handjob male male/male male_only mettasans mettaton mettaton_ex moaning profanity robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton shirt_lift shirt_up skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom swearing text tinyskeletonfucker tongue tongue_out top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton bdsm blindfold blindfolded bondage boots bottom_sans digital_media_(artwork) dominant dominant_male domination fel-fisk hair humanoid humanoid_robot male male/male male_only maledom malesub mettasans mettaton mettaton_ex nude pink_boots robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton sinisk skeleton stepped_on submissive submissive_male top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton bdsm blindfold blindfolded bondage boots bottom_sans digital_media_(artwork) dominant dominant_male domination fel-fisk hair humanoid humanoid_robot male male/male male_only maledom malesub mettasans mettaton mettaton_ex nude pink_boots robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton sinisk skeleton stepped_on submissive submissive_male top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2017 2boys 2d 2d_(artwork) animated_skeleton artist_request big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller black_hair blue_blush blush bottom_sans completely_naked completely_nude digital_media_(artwork) grabbing_arms hair hair_over_one_eye humanoid humanoid_robot larger_penetrating larger_penetrating_smaller legs_spread licking licking_head male male/male male_only male_penetrating mettasans mettaton mettaton_ex nude penetration pink_blush pink_eyes robot robot_boy robot_humanoid robotic_penis sans sans_(undertale) seme_mettaton sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom spread_legs sweat top_mettaton trembling_legs uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2010s 2017 2boys 2d 2d_(artwork) animated_skeleton artist_request big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller black_hair blue_blush blush bottom_sans completely_naked completely_nude digital_media_(artwork) grabbing_arms hair hair_over_one_eye humanoid humanoid_robot larger_penetrating larger_penetrating_smaller legs_spread licking licking_head male male/male male_only male_penetrating mettasans mettaton mettaton_ex nude penetration pink_blush pink_eyes robot robot_boy robot_humanoid robotic_penis sans sans_(undertale) seme_mettaton sex skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom spread_legs sweat top_mettaton trembling_legs uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
1boy 1boy1girl 1girl 2016 2d 2d_(artwork) breasts digital_media_(artwork) faceless_female female femsub hair hair_over_one_eye humanoid humanoid_robot male male/female male_focus maledom mettaton mettaton_ex nipples nude nude_female partial_female penetration robot robot_boy robot_humanoid seme_mettaton sex sinningskeletontrash solo_focus straight third-party_source top_mettaton tumblr undertale undertale_(series) unseen_female_face video_game_character video_games
1boy 1boy1girl 1girl 2016 2d 2d_(artwork) breasts digital_media_(artwork) faceless_female female femsub hair hair_over_one_eye humanoid humanoid_robot male male/female male_focus maledom mettaton mettaton_ex nipples nude nude_female partial_female penetration robot robot_boy robot_humanoid seme_mettaton sex sinningskeletontrash solo_focus straight third-party_source top_mettaton tumblr undertale undertale_(series) unseen_female_face video_game_character video_games
2d 2d_(artwork) anthro barelynsfw blush breast_out breasts breasts_out_of_clothes cat catty_(undertale) digital_media_(artwork) domestic_cat fangs felid feline female female_anthro fingering fingering_another fingering_partner fingering_pussy hair heart_eyes humanoid humanoid_robot male male/female mettaton mettaton_ex monster monster_girl nipples overalls purple_fur robot robot_boy robot_humanoid seme_mettaton simple_background solid_color_background straight top_mettaton undertale undertale_(series) video_game_character video_games white_background
2d 2d_(artwork) anthro barelynsfw blush breast_out breasts breasts_out_of_clothes cat catty_(undertale) digital_media_(artwork) domestic_cat fangs felid feline female female_anthro fingering fingering_another fingering_partner fingering_pussy hair heart_eyes humanoid humanoid_robot male male/female mettaton mettaton_ex monster monster_girl nipples overalls purple_fur robot robot_boy robot_humanoid seme_mettaton simple_background solid_color_background straight top_mettaton undertale undertale_(series) video_game_character video_games white_background
2d 2d_(artwork) anthro barelynsfw blush breast_out breasts breasts_out_of_clothes cat catty_(undertale) digital_media_(artwork) domestic_cat fangs felid feline female female_anthro fingering fingering_another fingering_partner fingering_pussy hair heart_eyes humanoid humanoid_robot male male/female mettaton mettaton_ex monster monster_girl nipples orange_background overalls purple_fur robot robot_boy robot_humanoid seme_mettaton simple_background solid_color_background straight top_mettaton undertale undertale_(series) video_game_character video_games
2d 2d_(artwork) anthro barelynsfw blush breast_out breasts breasts_out_of_clothes cat catty_(undertale) digital_media_(artwork) domestic_cat fangs felid feline female female_anthro fingering fingering_another fingering_partner fingering_pussy hair heart_eyes humanoid humanoid_robot male male/female mettaton mettaton_ex monster monster_girl nipples orange_background overalls purple_fur robot robot_boy robot_humanoid seme_mettaton simple_background solid_color_background straight top_mettaton undertale undertale_(series) video_game_character video_games
1:1 1:1_aspect_ratio 2boys 2d 2d_(artwork) animated_skeleton artist_request blush boots bottom_sans digital_media_(artwork) hair hair_over_one_eye humanoid humanoid_robot male male/male male_only mettasans mettaton mettaton_ex nervous penis pink_background pink_boots robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton simple_background skeleton top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2boys 2d 2d_(artwork) animated_skeleton artist_request blush boots bottom_sans digital_media_(artwork) hair hair_over_one_eye humanoid humanoid_robot male male/male male_only mettasans mettaton mettaton_ex nervous penis pink_background pink_boots robot robot_boy robot_humanoid sans sans_(undertale) seme_mettaton simple_background skeleton top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2015 2boys 2d 2d_(artwork) adorable ambiguous_penetration artist_request balls big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_cum blue_glans blue_penis blush circumcised colored_cum cousins crying cum cum_inside cum_on_body cum_while_penetrated cumshot cute cute_penis digital_media_(artwork) dominant_pov duo ejaculation erection ghost hands-free humanoid incest larger_male larger_penetrating larger_penetrating_smaller male male_only male_penetrated male_penetrating male_penetrating_male male_pov mettablook mettaton mettaton_ex napstablook one_eye_closed open_mouth orgasm penetrating_pov penetration penetrator_pov pink_cum pink_glans pov purple_penis robot robot_boy robot_humanoid robotic_penis seme_mettaton sex simple_background small_balls small_penis small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom smooth_penis tears text top_mettaton undertale undertale_(series) unusual_cum video_game_character video_games white_penis yaoi
2010s 2015 2boys 2d 2d_(artwork) adorable ambiguous_penetration artist_request balls big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_cum blue_glans blue_penis blush circumcised colored_cum cousins crying cum cum_inside cum_on_body cum_while_penetrated cumshot cute cute_penis digital_media_(artwork) dominant_pov duo ejaculation erection ghost hands-free humanoid incest larger_male larger_penetrating larger_penetrating_smaller male male_only male_penetrated male_penetrating male_penetrating_male male_pov mettablook mettaton mettaton_ex napstablook one_eye_closed open_mouth orgasm penetrating_pov penetration penetrator_pov pink_cum pink_glans pov purple_penis robot robot_boy robot_humanoid robotic_penis seme_mettaton sex simple_background small_balls small_penis small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom smooth_penis tears text top_mettaton undertale undertale_(series) unusual_cum video_game_character video_games white_penis yaoi
2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller biting_clothes biting_shirt blush bottom_sans clothed clothing comic crying crying_with_eyes_open dialogue digital_media_(artwork) duo english_text erection forced hair hair_over_one_eye heart humanoid humanoid_robot hurt hurt_expression larger_male larger_penetrating larger_penetrating_smaller male male/male male_only mettasans mettaton mettaton_ex monochrome monster open_mouth partially_colored penetration penis questionable_consent robot robot_boy robot_humanoid robotic_penis sans sans_(undertale) seme_mettaton sex simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom smile surprise_sex tears text thesourceofmysins tongue top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller biting_clothes biting_shirt blush bottom_sans clothed clothing comic crying crying_with_eyes_open dialogue digital_media_(artwork) duo english_text erection forced hair hair_over_one_eye heart humanoid humanoid_robot hurt hurt_expression larger_male larger_penetrating larger_penetrating_smaller male male/male male_only mettasans mettaton mettaton_ex monochrome monster open_mouth partially_colored penetration penis questionable_consent robot robot_boy robot_humanoid robotic_penis sans sans_(undertale) seme_mettaton sex simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom smile surprise_sex tears text thesourceofmysins tongue top_mettaton uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2d 2d_(artwork) anthro black_panties black_tank_top blush blushing breasts clitoris digital_media_(artwork) female fish fish_girl furry hair humanoid humanoid_robot kiss kiss_mark kissing male/female mettaton mettaton_ex monster_girl nipples panties pussy robot robot_boy robot_humanoid seme_mettaton shirt_lift shirt_up tank_top tank_top_lift top_mettaton undertale underwear undyne video_game_character video_games
2d 2d_(artwork) anthro black_panties black_tank_top blush blushing breasts clitoris digital_media_(artwork) female fish fish_girl furry hair humanoid humanoid_robot kiss kiss_mark kissing male/female mettaton mettaton_ex monster_girl nipples panties pussy robot robot_boy robot_humanoid seme_mettaton shirt_lift shirt_up tank_top tank_top_lift top_mettaton undertale underwear undyne video_game_character video_games