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2010s 2boys 2d 2d_(artwork)anal animated_skeleton artist_request big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_penis blush boots bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_male clothed_sex comic_sans cuddle cuddle_sex cum cum_inside digital_media_(artwork)duo ectopenis ejaculation english_text fluids fontcest footwear gay genital_fluids genitals gloves hoodie hugged_from_behind hugging hugging_from_behind incest intraspecies larger_male larger_penetrating larger_penetrating_smaller lying_down lying_on_back male male/male male_masturbation male_only male_penetrated male_penetrating male_penetrating_male masturbating_while_penetrated masturbation monster monster_boy multiple_ejaculation multiple_orgasms orange_blush orange_penis papyrus papyrus_(font)papyrus_(undertale)papysans penetration penetration_through_clothes penile penile_masturbation penis penis_out penis_through_clothing pink_slippers red_boots red_gloves sans sans_(undertale)seme_papyrus sex sex_through_clothes sex_through_clothing shoes shoes_on sibling_incest siblings skeleton slippers small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom source_request spread_legs third-party_source top_papyrus uke_sans undead undertale undertale_(series)video_game_character video_games yaoi

2010s 2boys 2d 2d_(artwork) anal animated_skeleton artist_request big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_penis blush boots bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_male clothed_sex comic_sans cuddle cuddle_sex cum cum_inside digital_media_(artwork) duo ectopenis ejaculation english_text fluids fontcest footwear gay genital_fluids genitals gloves hoodie hugged_from_behind hugging hugging_from_behind incest intraspecies larger_male larger_penetrating larger_penetrating_smaller lying_down lying_on_back male male/male male_masturbation male_only male_penetrated male_penetrating male_penetrating_male masturbating_while_penetrated masturbation monster monster_boy multiple_ejaculation multiple_orgasms orange_blush orange_penis papyrus papyrus_(font) papyrus_(undertale) papysans penetration penetration_through_clothes penile penile_masturbation penis penis_out penis_through_clothing pink_slippers red_boots red_gloves sans sans_(undertale) seme_papyrus sex sex_through_clothes sex_through_clothing shoes shoes_on sibling_incest siblings skeleton slippers small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom source_request spread_legs third-party_source top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi

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