Rule 34 Dev - 2022 2boys 2d animated_skeleton arms_around_another arms_around_another's_neck artist_name artist_watermark biting biting_shoulder bottom_sans bottomwear brother/brother brothers clothed clothing digital_media drooling duo ectotongue empath__life fontcest grey_background hand_in_pants hand_under_clothes hands_on_another's_chest hands_on_chest humanoid incest intraspecies kissing making_out male male/male male_only monochrome monster monster_boy pants papyrus_(undertale) papysans partially_clothed partially_nude saliva saliva_on_tongue saliva_trail sans_(undertale) sequential sibling_incest siblings simple_background skeleton taking_off_clothes teeth tel_a_friend tongue top_papyrus topless topless_male undead undertale undertale_(series) undressing video_game_character video_games watermark yaoi|1033555

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