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underswap papyrus

1boy animated_skeleton blush clothing covering_mouth covering_own_mouth crying egg_vibrator hand_covering_mouth hoodie male male_only mattress_grab pants_down papyrus papyrus_(underswap) papyrus_au sex_toy skeleton underswap underswap_papyrus undertale_au vibrator vibrator_cord
1boy animated_skeleton blush clothing covering_mouth covering_own_mouth crying egg_vibrator hand_covering_mouth hoodie male male_only mattress_grab pants_down papyrus papyrus_(underswap) papyrus_au sex_toy skeleton underswap underswap_papyrus undertale_au vibrator vibrator_cord
2boys alternate_universe anal anal_sex animated_skeleton anterior_nasal_aperture bandana blue_bandanna blue_clothing blue_eyes blue_glans blue_gloves blue_handwear blue_hat blue_headwear blue_kerchief blue_penis blurry blush bodily_fluids bone bonetrouble bottomless clothed clothing cowboy cowboy_hat cowgirl_position cum cumshot duo ejaculation erection from_front_position gay genital_fluids genitals glans glistening glistening_genitalia glistening_glans glistening_penis gloves grin halloween halloween_costume handwear hat headgear headwear humanoid humanoid_genitalia humanoid_on_humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid humanoid_penis incest kerchief lightsaber_dick male male/male male_only male_penetrated male_penetrating male_penetrating_male neckerchief non-human on_bottom on_top one_eye_closed orgasm papyrus penetration penile penile_penetration penis penis_in_ass power_bottom sans sex simple_background skeleton smile star_eyes sweat teeth undead underswap underswap_papyrus underswap_sans undertale video_games yaoi
2boys alternate_universe anal anal_sex animated_skeleton anterior_nasal_aperture bandana blue_bandanna blue_clothing blue_eyes blue_glans blue_gloves blue_handwear blue_hat blue_headwear blue_kerchief blue_penis blurry blush bodily_fluids bone bonetrouble bottomless clothed clothing cowboy cowboy_hat cowgirl_position cum cumshot duo ejaculation erection from_front_position gay genital_fluids genitals glans glistening glistening_genitalia glistening_glans glistening_penis gloves grin halloween halloween_costume handwear hat headgear headwear humanoid humanoid_genitalia humanoid_on_humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid humanoid_penis incest kerchief lightsaber_dick male male/male male_only male_penetrated male_penetrating male_penetrating_male neckerchief non-human on_bottom on_top one_eye_closed orgasm papyrus penetration penile penile_penetration penis penis_in_ass power_bottom sans sex simple_background skeleton smile star_eyes sweat teeth undead underswap underswap_papyrus underswap_sans undertale video_games yaoi
2boys alternate_universe animated_skeleton anterior_nasal_aperture bandana blue_bandanna blue_clothing blue_eyes blue_gloves blue_handwear blue_hat blue_headwear blue_kerchief blush bodily_fluids bone bonetrouble bottomless clothed clothing cowboy cowboy_hat cowgirl_position duo from_front_position gay gloves grin halloween halloween_costume handwear hat headgear headwear humanoid incest kerchief male male/male male_only neckerchief non-human on_bottom on_top one_eye_closed papyrus sans sex simple_background skeleton smile star_eyes sweat teeth undead underswap underswap_papyrus underswap_sans undertale video_games yaoi
2boys alternate_universe animated_skeleton anterior_nasal_aperture bandana blue_bandanna blue_clothing blue_eyes blue_gloves blue_handwear blue_hat blue_headwear blue_kerchief blush bodily_fluids bone bonetrouble bottomless clothed clothing cowboy cowboy_hat cowgirl_position duo from_front_position gay gloves grin halloween halloween_costume handwear hat headgear headwear humanoid incest kerchief male male/male male_only neckerchief non-human on_bottom on_top one_eye_closed papyrus sans sex simple_background skeleton smile star_eyes sweat teeth undead underswap underswap_papyrus underswap_sans undertale video_games yaoi
ass blush brother brother/brother brothers butt femboy gay incest male male/male male_only papyrus papyrus_(underswap) sans skeleton tagme tagme_(artist) underswap underswap_papyrus underswap_sans undertail undertale
ass blush brother brother/brother brothers butt femboy gay incest male male/male male_only papyrus papyrus_(underswap) sans skeleton tagme tagme_(artist) underswap underswap_papyrus underswap_sans undertail undertale
2018 alternate_universe apron bigger_male blowjob blowjob_face blue_eyes blue_scarf bottomless comic_sans cum cum_on_face ectopenis english fallen9choirs fellatio incest larger_male long_skirt male orange_cock orange_hoodie orange_penis papyrus papyrus_au rule_63 sans sans_au skeleton star_eyes tagme underswap underswap_papyrus underswap_sans undertail undertale undertale_au
2018 alternate_universe apron bigger_male blowjob blowjob_face blue_eyes blue_scarf bottomless comic_sans cum cum_on_face ectopenis english fallen9choirs fellatio incest larger_male long_skirt male orange_cock orange_hoodie orange_penis papyrus papyrus_au rule_63 sans sans_au skeleton star_eyes tagme underswap underswap_papyrus underswap_sans undertail undertale undertale_au
2boys big_sub big_sub_small_dom big_sub_small_top bigger_sub blue_eyes covering_face daydream daydreaming dreaming embarrassed english_text flexibility flexible funny gay gay_domination gay_sex hiding_face holding_leg holding_leg_up holding_legs holding_legs_up imagining incest larger_penetrated male papyrus papyrus_au sans sans_(underswap) sans_au smaller_dom smaller_dom_larger_sub smaller_dominant smaller_penetrating splits sympharin symphysins text thinking_about_sex underswap underswap_papyrus underswap_sans undertale_au
2boys big_sub big_sub_small_dom big_sub_small_top bigger_sub blue_eyes covering_face daydream daydreaming dreaming embarrassed english_text flexibility flexible funny gay gay_domination gay_sex hiding_face holding_leg holding_leg_up holding_legs holding_legs_up imagining incest larger_penetrated male papyrus papyrus_au sans sans_(underswap) sans_au smaller_dom smaller_dom_larger_sub smaller_dominant smaller_penetrating splits sympharin symphysins text thinking_about_sex underswap underswap_papyrus underswap_sans undertale_au
animated_skeleton couch ectopenis green_couch green_sofa looking_at_viewer male male_only mykinkispapyrus orange_penis papyrus penis penis_out sitting sitting_on_couch sitting_on_sofa skeleton sofa solo solo_male tagme underswap underswap_papyrus undertail undertale untied_tie
animated_skeleton couch ectopenis green_couch green_sofa looking_at_viewer male male_only mykinkispapyrus orange_penis papyrus penis penis_out sitting sitting_on_couch sitting_on_sofa skeleton sofa solo solo_male tagme underswap underswap_papyrus undertail undertale untied_tie
1boy blush bondage cokoyang ectopenis kneeling male male_only orange_blush orange_penis papyrus papyrus_au skeleton solo solo_male tagme topless topless_male underswap underswap_papyrus undertail undertale undertale_au white_background
1boy blush bondage cokoyang ectopenis kneeling male male_only orange_blush orange_penis papyrus papyrus_au skeleton solo solo_male tagme topless topless_male underswap underswap_papyrus undertail undertale undertale_au white_background
1boy bottomless cokoyang ectopenis male male_only orange_penis orange_tongue orgasm_denial papyrus penis ribbon_around_penis saliva skeleton solo solo_male tagme underswap underswap_papyrus undertail undertale
1boy bottomless cokoyang ectopenis male male_only orange_penis orange_tongue orgasm_denial papyrus penis ribbon_around_penis saliva skeleton solo solo_male tagme underswap underswap_papyrus undertail undertale
cokoyang male_only papyrus skeleton tagme underswap underswap_papyrus undertail undertale
cokoyang male_only papyrus skeleton tagme underswap underswap_papyrus undertail undertale
2boys animated_skeleton arched_back big_sub bigger_sub bound_arms erection erection_under_clothes gagged incest male papyrus papyrus_au sans sans_au skeleton small_dom small_dom_big_sub smaller_dom soul_sex underswap underswap_papyrus underswap_sans undertale undertale_au
2boys animated_skeleton arched_back big_sub bigger_sub bound_arms erection erection_under_clothes gagged incest male papyrus papyrus_au sans sans_au skeleton small_dom small_dom_big_sub smaller_dom soul_sex underswap underswap_papyrus underswap_sans undertale undertale_au
2boys animated_skeleton blue_blush blush brother brothers collar collarbone couch incest leg_grab legs legs_on_hips legs_up looking_at_another looking_at_partner male male_only on_couch orange_blush papyrus papyrus_(underswap) papyrus_au partially_clothed partially_undressed sans skeleton underswap underswap_papyrus undertale undertale_au unseen_male_face
2boys animated_skeleton blue_blush blush brother brothers collar collarbone couch incest leg_grab legs legs_on_hips legs_up looking_at_another looking_at_partner male male_only on_couch orange_blush papyrus papyrus_(underswap) papyrus_au partially_clothed partially_undressed sans skeleton underswap underswap_papyrus undertale undertale_au unseen_male_face
artist_logo bite_mark cussing gay incest lizheru lizherubones male papyrus papyrus_(underswap) papyrus_au sans sans_au swearing tagme underfell underfell_sans underswap underswap_papyrus undertale undertale_au undertale_fanfiction yaoi
artist_logo bite_mark cussing gay incest lizheru lizherubones male papyrus papyrus_(underswap) papyrus_au sans sans_au swearing tagme underfell underfell_sans underswap underswap_papyrus undertale undertale_au undertale_fanfiction yaoi
2d character_request humanoid incest lizheru lizherubones male sex tagme tagme_(character) underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction
2d character_request humanoid incest lizheru lizherubones male sex tagme tagme_(character) underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction
2d 3boys 3monsters anthro belt black_hoodie blowjob blush cum cumming gay gay_sex humanoid incest lizheru lizherubones male male/male male_only male_penetrating male_penetrating_male oral oral_penetration oral_sex orange_hoodie orange_penis papyrus papyrus_(underswap) penis red_scarf rope rope_around_neck rope_bondage ropes sans sex sofa source_request underfell underfell_papyrus underfell_sans underswap underswap_papyrus undertale_(series) undertale_au undertale_fanfiction yaoi yellow_penis
2d 3boys 3monsters anthro belt black_hoodie blowjob blush cum cumming gay gay_sex humanoid incest lizheru lizherubones male male/male male_only male_penetrating male_penetrating_male oral oral_penetration oral_sex orange_hoodie orange_penis papyrus papyrus_(underswap) penis red_scarf rope rope_around_neck rope_bondage ropes sans sex sofa source_request underfell underfell_papyrus underfell_sans underswap underswap_papyrus undertale_(series) undertale_au undertale_fanfiction yaoi yellow_penis
blue_penis blush brothers ectopenis glowing_cum incest irrumatio male male_only orange_tongue papyrus_(underswap) penis_in_mouth sans sans_au skeleton tired_but_horny_(artist) underswap underswap_papyrus underswap_sans undertail undertale undertale_au
blue_penis blush brothers ectopenis glowing_cum incest irrumatio male male_only orange_tongue papyrus_(underswap) penis_in_mouth sans sans_au skeleton tired_but_horny_(artist) underswap underswap_papyrus underswap_sans undertail undertale undertale_au
3boys alternate_universe blue_blush blush clothed comic comic_page comic_panel error_sans_(fan_character) errortale fan_character ganzooky glowing_cum hi_res implied_double_penetration incest orange_blush papyrus papyrus_(underswap) papyrus_au sans sans_(underswap) sans_au sanscest skeleton tagme tongue underswap underswap_papyrus underswap_sans undertale undertale_au undertale_fanfiction yaoi
3boys alternate_universe blue_blush blush clothed comic comic_page comic_panel error_sans_(fan_character) errortale fan_character ganzooky glowing_cum hi_res implied_double_penetration incest orange_blush papyrus papyrus_(underswap) papyrus_au sans sans_(underswap) sans_au sanscest skeleton tagme tongue underswap underswap_papyrus underswap_sans undertale undertale_au undertale_fanfiction yaoi
2d 3boys english_text forced_yaoi humanoid imminent_rape imminent_sex incest male male_only papyrus papyrus_(underswap) papyrus_au rape robot_kin sans sans_au sanscest selfcest skeleton spitroast tagme talking text underfell underfell_sans underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction
2d 3boys english_text forced_yaoi humanoid imminent_rape imminent_sex incest male male_only papyrus papyrus_(underswap) papyrus_au rape robot_kin sans sans_au sanscest selfcest skeleton spitroast tagme talking text underfell underfell_sans underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction
1boy animated_skeleton blush bonely_hearts_club clothing ectopenis erect erection glowing_penis highres male_only mykinkispapyrus orange_penis papyrus papyrus_au penis pillow skeleton solo solo_male tagme underswap underswap_papyrus undertale undertale_au undertale_fanfiction
1boy animated_skeleton blush bonely_hearts_club clothing ectopenis erect erection glowing_penis highres male_only mykinkispapyrus orange_penis papyrus papyrus_au penis pillow skeleton solo solo_male tagme underswap underswap_papyrus undertale undertale_au undertale_fanfiction
animated_skeleton belly bhm big_belly big_moobs fat fat_man gay huge_belly hyper hyper_fat hyper_overweight love_handles male male_only moobs no_humans obese obese_male overweight overweight_male papyrus skeleton thick underswap underswap_papyrus undertale undertale_fanfiction weight_gain
animated_skeleton belly bhm big_belly big_moobs fat fat_man gay huge_belly hyper hyper_fat hyper_overweight love_handles male male_only moobs no_humans obese obese_male overweight overweight_male papyrus skeleton thick underswap underswap_papyrus undertale undertale_fanfiction weight_gain
1boy 1male animated_skeleton belly bhm big_belly big_moobs fat fat_man gay huge_belly huge_moobs hyper hyper_fat hyper_overweight immobile love_handles male male_only male_solo moobs morbidly_obese morbidly_obese_male nipples no_humans obese obese_male overweight overweight_male papyrus skeleton solo solo_male thick thick_ass thick_legs underswap underswap_papyrus undertale undertale_fanfiction weight_gain
1boy 1male animated_skeleton belly bhm big_belly big_moobs fat fat_man gay huge_belly huge_moobs hyper hyper_fat hyper_overweight immobile love_handles male male_only male_solo moobs morbidly_obese morbidly_obese_male nipples no_humans obese obese_male overweight overweight_male papyrus skeleton solo solo_male thick thick_ass thick_legs underswap underswap_papyrus undertale undertale_fanfiction weight_gain
anal anal_penetration anal_sex animated_skeleton bigger_male blue_penis cum cum_on_bed ectopenis gay glowing_cum glowing_genitalia glowing_penis hi_res incest larger_male larger_penetrated lizherubones male male/male male_only male_penetrating orange_penis papyrus papyrus_au penetration penis sans sans_au skeleton smaller_male smaller_penetrating tagme underswap underswap_papyrus underswap_sans undertale undertale_au undertale_fanfiction yaoi
anal anal_penetration anal_sex animated_skeleton bigger_male blue_penis cum cum_on_bed ectopenis gay glowing_cum glowing_genitalia glowing_penis hi_res incest larger_male larger_penetrated lizherubones male male/male male_only male_penetrating orange_penis papyrus papyrus_au penetration penis sans sans_au skeleton smaller_male smaller_penetrating tagme underswap underswap_papyrus underswap_sans undertale undertale_au undertale_fanfiction yaoi
2d 3boys blowjob bondage comic cum cum_in_mouth cum_in_pants cum_inside cum_on_face english_text fellatio forced_to_watch gay gay_sex helpless humanoid incest ksuriuri male male/male male_only papyrus_(underfell) papyrus_(underswap) papyrus_au sans sans_(underswap) sans_au talking text underfell underfell_papyrus underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction yaoi
2d 3boys blowjob bondage comic cum cum_in_mouth cum_in_pants cum_inside cum_on_face english_text fellatio forced_to_watch gay gay_sex helpless humanoid incest ksuriuri male male/male male_only papyrus_(underfell) papyrus_(underswap) papyrus_au sans sans_(underswap) sans_au talking text underfell underfell_papyrus underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction yaoi
1girls 2boys ambiguous_penetration blue_shorts blushing brown_hair brown_shorts cigarette doggy_style female female_frisk female_human female_penetrated frisk human human_penetrated kissing male male/female male/female/male male_penetrating male_penetrating_female on_bed orange_hoodie papyrus papyrus_(underswap) papyrus_au pussy_juice_drip red_gloves red_scarf red_sneakers rope skeletons smoking straight sweating underswap underswap_papyrus undertale undertale_au undertale_fanfiction unseen_female_face white_background white_shirt 悟空
1girls 2boys ambiguous_penetration blue_shorts blushing brown_hair brown_shorts cigarette doggy_style female female_frisk female_human female_penetrated frisk human human_penetrated kissing male male/female male/female/male male_penetrating male_penetrating_female on_bed orange_hoodie papyrus papyrus_(underswap) papyrus_au pussy_juice_drip red_gloves red_scarf red_sneakers rope skeletons smoking straight sweating underswap underswap_papyrus undertale undertale_au undertale_fanfiction unseen_female_face white_background white_shirt 悟空
2boys 2d artist_request bedroom blue_eyes brothers clothed cum cum_in_ass cum_inside fangs gay humanoid incest male male_only papyrus_au sans sans_au sex tagme tagme_(artist) underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction
2boys 2d artist_request bedroom blue_eyes brothers clothed cum cum_in_ass cum_inside fangs gay humanoid incest male male_only papyrus_au sans sans_au sex tagme tagme_(artist) underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction
alternate_universe animated_skeleton bone brother brothers duo ectopenis glowing_penis hi_res humanoid incest lizheru lizherubones male male_only oral papyrus papyrus_(underswap) papyrus_au sans sans_(underswap) sans_au sex sibling skeleton solo_focus television undead underswap underswap_papyrus underswap_sans undertale undertale_au undertale_fanfiction video_games
alternate_universe animated_skeleton bone brother brothers duo ectopenis glowing_penis hi_res humanoid incest lizheru lizherubones male male_only oral papyrus papyrus_(underswap) papyrus_au sans sans_(underswap) sans_au sex sibling skeleton solo_focus television undead underswap underswap_papyrus underswap_sans undertale undertale_au undertale_fanfiction video_games
deviantart_username frisk gay human human_on_humanoid human_penetrating humanoid_penetrated male male/male male_frisk male_human male_only papyrus papyrus_(underswap) papyrus_au penetration skeleton sketch underswap underswap_papyrus undertale undertale_au undertale_fanfiction yaoi
deviantart_username frisk gay human human_on_humanoid human_penetrating humanoid_penetrated male male/male male_frisk male_human male_only papyrus papyrus_(underswap) papyrus_au penetration skeleton sketch underswap underswap_papyrus undertale undertale_au undertale_fanfiction yaoi
1:1 anon bone cussing ectopenis english_text gay human lizheru lizherubones mammal oral orange_penis papyrus papyrus_(underswap) papyrus_au penis skeleton swearing text underswap underswap_papyrus undertale undertale_au undertale_fanfiction unseen_male_face video_games yaoi
1:1 anon bone cussing ectopenis english_text gay human lizheru lizherubones mammal oral orange_penis papyrus papyrus_(underswap) papyrus_au penis skeleton swearing text underswap underswap_papyrus undertale undertale_au undertale_fanfiction unseen_male_face video_games yaoi
1:1 animated_skeleton anon artist_logo blowjob bone ectopenis fellatio gay human lizheru lizherubones male mammal moaning orange_penis papyrus papyrus_(underswap) papyrus_au penis skeleton text undead underswap underswap_papyrus undertale undertale_au undertale_fanfiction video_games white_background yaoi
1:1 animated_skeleton anon artist_logo blowjob bone ectopenis fellatio gay human lizheru lizherubones male mammal moaning orange_penis papyrus papyrus_(underswap) papyrus_au penis skeleton text undead underswap underswap_papyrus undertale undertale_au undertale_fanfiction video_games white_background yaoi
1:1 2boys absurd_res anal anal_penetration anal_sex animated_skeleton balls bara bone brother brothers cum cum_in_ass cum_inside duo gay hi_res humanoid_penis incest male male/male male_only male_penetrated male_penetrating male_penetrating_male orgasm papyrus papyrus_(underswap) papyrus_au penetration penis redeyedgazer sans sans_(underswap) sans_au sibling skeleton undead underswap underswap_papyrus underswap_sans undertale undertale_au undertale_fanfiction video_games yaoi
1:1 2boys absurd_res anal anal_penetration anal_sex animated_skeleton balls bara bone brother brothers cum cum_in_ass cum_inside duo gay hi_res humanoid_penis incest male male/male male_only male_penetrated male_penetrating male_penetrating_male orgasm papyrus papyrus_(underswap) papyrus_au penetration penis redeyedgazer sans sans_(underswap) sans_au sibling skeleton undead underswap underswap_papyrus underswap_sans undertale undertale_au undertale_fanfiction video_games yaoi
2019 2boys 2d artist_name bandana black_sweatpants blue_bandana blue_blush blue_eyes blue_scarf bone ectopenis grumpy grumpy_sub hoodie hugging_penis humanoid incest lizheru lizherubones male male/male male_only orange_hoodie orange_penis papyrus_au penis sans sans_au scarf shoulder_pads simple_background skeleton solo_focus starry_eyes sweatpants text underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction unseen_male_face white_background
2019 2boys 2d artist_name bandana black_sweatpants blue_bandana blue_blush blue_eyes blue_scarf bone ectopenis grumpy grumpy_sub hoodie hugging_penis humanoid incest lizheru lizherubones male male/male male_only orange_hoodie orange_penis papyrus_au penis sans sans_au scarf shoulder_pads simple_background skeleton solo_focus starry_eyes sweatpants text underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction unseen_male_face white_background
1:1 1boy animated_skeleton artist_logo blush bone clothed ectopenis glowing_penis hoodie humanoid humanoid_penis lizheru lizherubones looking_at_own_penis male male_only off_shoulder orange_blush orange_hoodie orange_penis papyrus papyrus_au penis penis_out skeleton solo solo_male undead underswap underswap_papyrus undertale undertale_au undertale_fanfiction video_games
1:1 1boy animated_skeleton artist_logo blush bone clothed ectopenis glowing_penis hoodie humanoid humanoid_penis lizheru lizherubones looking_at_own_penis male male_only off_shoulder orange_blush orange_hoodie orange_penis papyrus papyrus_au penis penis_out skeleton solo solo_male undead underswap underswap_papyrus undertale undertale_au undertale_fanfiction video_games
1:1 1boy after_ejaculation animated_skeleton artist_logo bone couch cum ectopenis humanoid humanoid_penis lizherubones male male_only orange_cum orange_penis papyrus papyrus_(underswap) papyrus_au penis skeleton sofa solo solo_male undead underswap underswap_papyrus undertale undertale_au video_games
1:1 1boy after_ejaculation animated_skeleton artist_logo bone couch cum ectopenis humanoid humanoid_penis lizherubones male male_only orange_cum orange_penis papyrus papyrus_(underswap) papyrus_au penis skeleton sofa solo solo_male undead underswap underswap_papyrus undertale undertale_au video_games
2boys 2d anal ass balls belly_bulge big_belly blue_body cum cum_in_ass cum_inside cumflation dat_ass dog_ears dog_tail ectobody english_text gay humanoid incest inflation male mellednsfw orange_body papyrus papyrus_(underswap) papyrus_au sans sans_(underswap) sans_au sex tagme tail talking text text_bubble underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction vaginal_penetration yaoi
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2boys 2d blue_body dog_ears dog_tail ectobody english_text humanoid incest male mellednsfw orange_body papyrus papyrus_(underswap) papyrus_au penetration sans sans_(underswap) sans_au sex tagme tail_wagging talking text text_bubble underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction wagging_tail yaoi
2boys 2d blue_body dog_ears dog_tail ectobody english_text humanoid incest male mellednsfw orange_body papyrus papyrus_(underswap) papyrus_au penetration sans sans_(underswap) sans_au sex tagme tail_wagging talking text text_bubble underswap underswap_papyrus underswap_sans undertale_(series) undertale_au undertale_fanfiction wagging_tail yaoi