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2016 2boys blush bone brothers comic duo_focus english_text frottage gay incest male male_only masturbation monster papyrus penis penis_rubbing rubbing sans sex sibling skeleton text underfell underfell_papyrus underfell_sans undertale undertale_fanfiction undertale_papyrus undertale_sans unseen_character yaoi
2016 2boys blush bone brothers comic duo_focus english_text frottage gay incest male male_only masturbation monster papyrus penis penis_rubbing rubbing sans sex sibling skeleton text underfell underfell_papyrus underfell_sans undertale undertale_fanfiction undertale_papyrus undertale_sans unseen_character yaoi
against_door blush brothers comic english_text incest male monster papyrus_au penetration sans sans_au sex sibling skeleton text tongue_out underfell underfell_papyrus underfell_sans undertale undertale_fanfiction undertale_sans unseen_male_face yaoi
against_door blush brothers comic english_text incest male monster papyrus_au penetration sans sans_au sex sibling skeleton text tongue_out underfell underfell_papyrus underfell_sans undertale undertale_fanfiction undertale_sans unseen_male_face yaoi
6_arms arachnid arthropod fellatio group group_sex muffet oral penis sans sex skeleton spider threesome undead underfell underfell_sans undertale undertale_fanfiction undertale_sans video_games
6_arms arachnid arthropod fellatio group group_sex muffet oral penis sans sex skeleton spider threesome undead underfell underfell_sans undertale undertale_fanfiction undertale_sans video_games
1boy 2010s 2016 alkipunch animated_skeleton artist_name autofellatio blowjob blue_blush blue_penis blush blushing bone clothed clothing ectopenis fellatio grabbing_sheets gripping_sheets highres hooded_jacket hoodie jacket male male_only masturbation monster oral penis sans sans_(undertale) self_blowjob self_oral selfsuck skeleton sneakers solo solo_male sucking_own_penis sucking_penis sweat undead undertail undertale undertale_(series) undertale_sans
1boy 2010s 2016 alkipunch animated_skeleton artist_name autofellatio blowjob blue_blush blue_penis blush blushing bone clothed clothing ectopenis fellatio grabbing_sheets gripping_sheets highres hooded_jacket hoodie jacket male male_only masturbation monster oral penis sans sans_(undertale) self_blowjob self_oral selfsuck skeleton sneakers solo solo_male sucking_own_penis sucking_penis sweat undead undertail undertale undertale_(series) undertale_sans
1boy animated_skeleton blue_penis bone clothed cum ectopenis male male_only one_eye_closed penis sans skeleton solo solo_male transparent_background undertail undertale undertale_(series) undertale_sans video_games
1boy animated_skeleton blue_penis bone clothed cum ectopenis male male_only one_eye_closed penis sans skeleton solo solo_male transparent_background undertail undertale undertale_(series) undertale_sans video_games
1boy 2015 animated_skeleton bed blue_blush blue_penis blush blushing bone clothed clothes ectopenis embarrassed erect_penis erection glowing glowing_penis leaking_penis leaking_precum lizardbat_(artist) male male_only nervous penis penis_out pov precum precum_leaking precum_on_penis sans skeleton skull solo solo_male sweat tentabat undertale undertale_sans
1boy 2015 animated_skeleton bed blue_blush blue_penis blush blushing bone clothed clothes ectopenis embarrassed erect_penis erection glowing glowing_penis leaking_penis leaking_precum lizardbat_(artist) male male_only nervous penis penis_out pov precum precum_leaking precum_on_penis sans skeleton skull solo solo_male sweat tentabat undertale undertale_sans