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2010s 2017 2boys anal animated_skeleton arm_around_another's_neck arm_around_neck arm_around_shoulder big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blush bottom_sans bottomless brother/brother brother_penetrating_brother brothers carrying carrying_partner clothed drooling duo ectopenis fontcest gay grabbing_legs incest larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_spread looking_down male male/male male_penetrating monster monster_boy papyrus papyrus_(undertale)papysans penetration reverse_suspended_congress sans sans_(undertale)seme_papyrus sex sibling_incest siblings sitting skeleton sketch small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom thebrosgf third-party_source top_papyrus tumblr uke_sans undead undertale undertale_(series)white_background yaoi

2010s 2017 2boys anal animated_skeleton arm_around_another's_neck arm_around_neck arm_around_shoulder big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blush bottom_sans bottomless brother/brother brother_penetrating_brother brothers carrying carrying_partner clothed drooling duo ectopenis fontcest gay grabbing_legs incest larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_spread looking_down male male/male male_penetrating monster monster_boy papyrus papyrus_(undertale) papysans penetration reverse_suspended_congress sans sans_(undertale) seme_papyrus sex sibling_incest siblings sitting skeleton sketch small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom thebrosgf third-party_source top_papyrus tumblr uke_sans undead undertale undertale_(series) white_background yaoi

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