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uke_sans undead undertale undertale_(series) unseen_male_face 2010 2019 2boys animated_skeleton blush blush_lines bottom_sans bottomless clothed clothed_male duo ectoplasm fingering fingering_another fingering_partner fire_elemental ganzooky glasses grillby grillby_(undertale) grillsans hand_on_another's_shoulder handjob kneeling line_art lineart looking_away male male_only monochrome mutual_masturbation nsfwsinningsans partially_clothed penis sans sans_(undertale) seme_grillby skeleton standing tongue_out top_grillby uke_sans undead undertale undertale_(series) 1:1 1:1_aspect_ratio 2010s 2019 animated_skeleton bottom_sans bottomless bound_wrists closed_eyes crossdressing line_art lineart lingerie male_only moaning monochrome nightgown nsfwgarbagedump patreon_reward sans sans_(undertale) skeleton socks socks_on solo submissive text tied_up tied_wrists uke_sans undead undertale undertale_(series) underwear white_background 2020 2020s animal_genitalia animal_penis animated_skeleton belly_bulge big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller bottom_sans brother brother/brother brother_and_brother brothers crying crying_with_eyes_open diphallism drool duo ectobody ectopenis fontcest from_behind gaster_blaster genitals grabbing_arms grabbing_from_behind hemipenes huge_cock huge_penis incest larger_male larger_penetrating larger_penetrating_smaller line_art lineart male male_out_of_frame male_penetrating monster naked non-con non-consensual noncon nonconsensual nsfwgarbagedump papysans penetration penis prison_guard_position rape sans sans_(undertale) seme_papyrus sequence sequential sex size_difference skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus tears top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face veiny_penis white_background yaoi 2020 2020s animal_genitalia animal_penis animated_skeleton begging_to_stop 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