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2d 2d_(artwork) ahegao animal animated_skeleton annoying_dog_(undertale) beastiality bigger_penetrating bigger_penetrating_smaller blue_tongue bonetrouble bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers canid canine carrying carrying_partner digital_media_(artwork) dog english_text feral feral_on_male feral_penetrating feral_penetrating_humanoid fontcest heart heart-shaped_pupils heart_eyes hooded_jacket hoodie implied_double_penetration implied_penetration implied_sex incest interspecies intraspecies larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_spread male male/male male/male/male male_ahegao male_only male_penetrating mammal monochrome monster monster_boy papyrus papyrus_(undertale) papysans reverse_suspended_congress sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton smaller_feral smaller_male smaller_penetrating solo_focus source_request spread_legs text threesome toby_fox tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_games white_background yaoi zoophilia

2d 2d_(artwork)ahegao animal animated_skeleton annoying_dog_(undertale)beastiality bigger_penetrating bigger_penetrating_smaller blue_tongue bonetrouble bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers canid canine carrying carrying_partner digital_media_(artwork)dog english_text feral feral_on_male feral_penetrating feral_penetrating_humanoid fontcest heart heart-shaped_pupils heart_eyes hooded_jacket hoodie implied_double_penetration implied_penetration implied_sex incest interspecies intraspecies larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_spread male male/male male/male/male male_ahegao male_only male_penetrating mammal monochrome monster monster_boy papyrus papyrus_(undertale)papysans reverse_suspended_congress sans sans_(undertale)seme_papyrus sibling_incest siblings skeleton smaller_feral smaller_male smaller_penetrating solo_focus source_request spread_legs text threesome toby_fox tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series)unseen_male_face video_games white_background yaoi zoophilia

2d 2d_(artwork) ahegao animal animated_skeleton annoying_dog_(undertale) beastiality bigger_penetrating bigger_penetrating_smaller blue_tongue bonetrouble bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers canid canine carrying carrying_partner digital_media_(artwork) dog english_text feral feral_on_male feral_penetrating feral_penetrating_humanoid fontcest heart heart-shaped_pupils heart_eyes hooded_jacket hoodie implied_double_penetration implied_penetration implied_sex incest interspecies intraspecies larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_spread male male/male male/male/male male_ahegao male_only male_penetrating mammal monochrome monster monster_boy papyrus papyrus_(undertale) papysans reverse_suspended_congress sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton smaller_feral smaller_male smaller_penetrating solo_focus source_request spread_legs text threesome toby_fox tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_games white_background yaoi zoophilia

1boy 2010s 2015 2d 2d_(artwork) ahegao animated_skeleton arms_behind_back blue_blush blue_penis blue_tongue blush bodily_fluids bound_arms chubby chubby_male clothed clothing cum digital_media_(artwork) ectopenis erect_penis erection fluids hands_behind_back heart heart_eyes male male_ahegao male_only monochrome monster orgasm_face overstimulation penis penis_out pleasure_face sans sans_(undertale) sitting skeleton solo_male spread_legs suckmytrombone sweat sweater text tied_arms tied_up tongue tongue_out undead undertale undertale_(series) video_games white_background

2020s 2022 2d ahe_gao ahegao animated_skeleton anon anonymous_male arm_grab bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans clothed crying digital_media_(artwork) drooling faceless_male fingers_interlocked grabbing_arm grabbing_hand grabbing_hands hand_grab hoodie interlocked_fingers intertwined_fingers japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male male_ahegao missionary_position monster monster_boy on_back sans sans_(undertale) size_difference skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text tongue tongue_out uke_sans undead undertale undertale_(series) unseen_male_face yaoi