Rule 34 Dev - ... 13thcatofthegate 2018 2boys 2d animated_skeleton bigger_male blue_blush blue_tongue blush brother/brother brothers comic comic_page comic_panel comic_sans digital_media duo ectotongue english_text fontcest gay hand_on_another's_chest hand_on_chest humanoid incest indoors intraspecies kissing kissing_cheek larger_male licking_tongue making_out male male/male male_only monster orange_blush orange_tongue papyrus_(undertale) papysans partially_colored sans_(undertale) sequential shirt_removed shorter_male sibling_incest siblings skeleton smaller_male speech_bubble spoken_ellipsis taking_off_clothes taller_male text tongue topless topless_male undead undertale undertale_(series) undressing undressing_another undressing_partner video_game_character video_games yaoi|1027059

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