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2boys alternate_universe anal animated_skeleton artist_name belt bigger_male bigger_penetrating bigger_penetrating_smaller brother_penetrating_brother collar ectopenis ectoplasm ectotongue gloves grabbing_penis incest indoors larger_male larger_penetrating larger_penetrating_smaller leash leash_pull leash_pulling male male/male male_only male_penetrated moaning nasty-fox onomatopoeia papyrus papyrus_(underfell) papyrus_au penetration penis red_eyes red_gloves red_penis red_scarf sans sans_(underfell) sans_au scarf sex skeleton smaller_male tongue tongue_out unbuckled_belt underfell underfell_papyrus underfell_sans undertale undertale_au undertale_fanfiction yaoi
2boys alternate_universe anal animated_skeleton artist_name belt bigger_male bigger_penetrating bigger_penetrating_smaller brother_penetrating_brother collar ectopenis ectoplasm ectotongue gloves grabbing_penis incest indoors larger_male larger_penetrating larger_penetrating_smaller leash leash_pull leash_pulling male male/male male_only male_penetrated moaning nasty-fox onomatopoeia papyrus papyrus_(underfell) papyrus_au penetration penis red_eyes red_gloves red_penis red_scarf sans sans_(underfell) sans_au scarf sex skeleton smaller_male tongue tongue_out unbuckled_belt underfell underfell_papyrus underfell_sans undertale undertale_au undertale_fanfiction yaoi
4_toes absurd_res animal_genitalia barbed_penis bondage bound canid canine canis claws collar domestic_cat domestic_dog domination faxby feet feet_in_face felid feline felis foot_fetish fox fur furry handcuffs harness hi_res hybrid knot labrador leash leash_pulling leather male mammal musk orgasm pawpads paws pee_on_face peeing penis shackles sheath striped_fur stripes submissive tabby toe_claws toes urine watersports yaoi yomari_u zax
4_toes absurd_res animal_genitalia barbed_penis bondage bound canid canine canis claws collar domestic_cat domestic_dog domination faxby feet feet_in_face felid feline felis foot_fetish fox fur furry handcuffs harness hi_res hybrid knot labrador leash leash_pulling leather male mammal musk orgasm pawpads paws pee_on_face peeing penis shackles sheath striped_fur stripes submissive tabby toe_claws toes urine watersports yaoi yomari_u zax
4_toes absurd_res animal_genitalia barbed_penis bondage bound canid canine canis claws collar cum cum_on_face cumshot domestic_cat domestic_dog domination ejaculation faxby feet feet_in_face felid feline felis foot_fetish fox fur furry handcuffs harness hi_res hybrid knot labrador leash leash_pulling leather male mammal musk orgasm pawpads paws penis shackles sheath striped_fur stripes submissive tabby toe_claws toes yaoi yomari_u zax
4_toes absurd_res animal_genitalia barbed_penis bondage bound canid canine canis claws collar cum cum_on_face cumshot domestic_cat domestic_dog domination ejaculation faxby feet feet_in_face felid feline felis foot_fetish fox fur furry handcuffs harness hi_res hybrid knot labrador leash leash_pulling leather male mammal musk orgasm pawpads paws penis shackles sheath striped_fur stripes submissive tabby toe_claws toes yaoi yomari_u zax
4_toes 5_fingers anal anal_sex animal_genitalia anthro ball_gag barbed_penis bed big_penis binding bondage bound canid canine canis claws collar cum cum_inside cum_on_chest cum_on_self cum_on_stomach cumshot domestic_cat domestic_dog ejaculation faxby feet felid feline felis fingers foot_fetish foot_lick fox fur furry gag harness hi_res humanoid_hands hybrid knot knotting labrador leash leash_pulling leather licking male mammal orgasm pawpads paws penetration penis popping saliva sex sheath slobber striped_fur stripes submissive tabby toe_claws toes tongue tongue_out yaoi yomari_u zax
4_toes 5_fingers anal anal_sex animal_genitalia anthro ball_gag barbed_penis bed big_penis binding bondage bound canid canine canis claws collar cum cum_inside cum_on_chest cum_on_self cum_on_stomach cumshot domestic_cat domestic_dog ejaculation faxby feet felid feline felis fingers foot_fetish foot_lick fox fur furry gag harness hi_res humanoid_hands hybrid knot knotting labrador leash leash_pulling leather licking male mammal orgasm pawpads paws penetration penis popping saliva sex sheath slobber striped_fur stripes submissive tabby toe_claws toes tongue tongue_out yaoi yomari_u zax