Xbooru - 2020s 2021 2boys 2d 2d (artwork) 2males abosinsin anal animated skeleton bad id bad twitter id big penis bigger male bigger penetrating bigger penetrating smaller blue blush blue penis blue tongue blush boots bottom on top bottom sans brother brother/brother brother and brother brother penetrating brother brothers closed eyes clothed clothed sex digital media (artwork) duo ectopenis ectotongue edit edited erect while penetrated erection fontcest gay genitals hand on another's shoulder hooded jacket hoodie inactive account incest intraspecies jacket larger male larger penetrating larger penetrating smaller line art lineart looking pleasured lying down male male/male male only male penetrated male penetrating male penetrating male moaning monster monster boy open mouth orange blush orange penis overstimulation papyrus papyrus (font) papyrus (undertale) papysans partially colored penetration penis penis size difference pleasure face sans sans (undertale) seme papyrus service top sex sex through clothes sex through clothing sibling incest siblings size difference skeleton small penis smaller male smaller penetrated smooth penis sweat tears tears of pleasure text third-party edit tongue tongue grab tongue out top papyrus twitter username uke sans undead undertale undertale (series) veiny penis video game character video games x-ray yaoi | 1024946

2020s 2021 2boys 2d 2d_(artwork) 2males abosinsin anal animated_skeleton bad_id bad_twitter_id big_penis bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blue_tongue blush boots bottom_on_top bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothed_sex digital_media_(artwork) duo ectopenis ectotongue edit edited erect_while_penetrated erection fontcest gay genitals hand_on_another's_shoulder hooded_jacket hoodie inactive_account incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller line_art lineart looking_pleasured lying_down male male/male male_only male_penetrated male_penetrating male_penetrating_male moaning monster monster_boy open_mouth orange_blush orange_penis overstimulation papyrus papyrus_(font) papyrus_(undertale) papysans partially_colored penetration penis penis_size_difference pleasure_face sans sans_(undertale) seme_papyrus service_top sex sex_through_clothes sex_through_clothing sibling_incest siblings size_difference skeleton small_penis smaller_male smaller_penetrated smooth_penis sweat tears tears_of_pleasure text third-party_edit tongue tongue_grab tongue_out top_papyrus twitter_username uke_sans undead undertale undertale_(series) veiny_penis video_game_character video_games x-ray yaoi

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