Rule 34 Dev - 1boy 2020s 2023 2d 2d_(artwork) alternate_version_available animated_skeleton arm_support blue_hoodie blue_jacket blush bulge clothed clothed_male digital_media_(artwork) erection erection_under_clothes floor fully_clothed fully_clothed_male hooded_jacket hoodie jacket japanese_text konoha6_(pixiv_id_1724049) large_filesize legs_apart legs_spread looking_down male male_only monster monster_boy on_floor sans sans_(undertale) sequence sequential sitting sitting_on_floor skeleton solo_male spoken_heart submissive sweat tears text undead undertale undertale_(series) video_games|1025554