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1cuntboy 2010s 2016 2boys 3boys alternate_universe animated animated_skeleton bandana blue_pussy bones boots closed_eyes cuntboy cuntboy_focus cuntboy_penetrated ectobody ectopenis ectopussy gif glowing_penis hand_on_head hand_on_hip head_grab incest intersex licking_penis male male_penetrating male_penetrating_cuntboy monochrome no_pants orange_penis papyrus papyrus_(underswap) papyrus_au penetration penis pussy sans sans_(underswap) sans_au scarf sex shoulder_pads simple_background skeleton solo_focus stroking_penis threesome titleze trio underswap underswap_papyrus underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction unseen_male_face vaginal vaginal_insertion vaginal_penetration yaoi
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2018 2boys 2d alternate_universe anal anal_insertion anal_play anal_prodding anal_sex animated animated_skeleton ass ass_grab backsack ballsack begging big_ass big_butt black_gloves black_hoodie black_sclera blush bondage bone brother_and_brother brothers butt collar dead_source dildo drooling ectobody ectobutt english_text everydaysins femboy feminine_male gay gif gloves grabbing_ass hand_on_butt hoodie hoodie_only humanoid improvised_dildo improvised_sex_toy incest latex_gloves male male_focus male_penetrated monster papyrus_(underfell) papyrus_au rape red_ass red_blush red_body red_eyes sans sans_(underfell) sans_au sex_toy skeleton socks solo_focus spiked_collar sweating talking testicles text tongue tongue_out tumblr_username undead underfell underfell_papyrus underfell_sans undertale_(series) undertale_au undertale_fanfiction url white_socks
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... ? accidental_circumstance accidental_incest angry animated animated_skeleton blue_eyes blue_sans_penis blue_sans_tongue blush bone clothed clothed_sex clothing collar confusion fellatio gay gif group heart incest leash male male/male male_only meta_request mistaken_identity multiple_boys nsfwshamecave oral papyrus_(underfell) papyrus_au penis sans sans_(underfell) sans_au sans_blush sans_eye sans_glowing_eye sans_penis sans_tongue semi_incest skeleton undead undertale yaoi