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2015 ahe_gao all_fours animated_skeleton anthro anthro_penetrating arm_hair asgore_dreemurr balls barazoku belly biceps big_dom_small_sub bigger_male blonde_hair blue_eyes blue_penis blue_tongue body_hair bone boss_monster bottomless buttdawg caprine chest_hair closed_eyes clothed clothing cum cum_while_penetrated cumshot duo ectopenis from_behind from_behind_position fur gay gay_anal goat hairy happy_trail interspecies larger_male male male/male male_anthro male_only mammal meta_request monster multicolored_fur musclegut naked nipples nude one_eye_closed orgasm pecs penetration penis pubes sans sans_blue_tongue sans_blush sans_eye sans_glowing_eye sans_penis sans_tongue sex shirt simple_background size_difference skeleton slightly_chubby smaller_male smile standing stomach_hair sweat teeth thick_thighs tongue tongue_out two_tone_fur undead undertale video_games white_background white_fur yaoi yellow_fur