Rule 34 Dev - anthro anus balls blush bound box butt container curled_up encasement erection femboy fuck_box fur genitals hair humanoid_genitalia humanoid_penis in_box in_container lying male nude on_back paws penis penis_backwards pet_carrier public_use sex_box shaking short_tail simple_background small_balls small_penis solo tail through_wall trembling duskihorns domestic_cat felid feline felis mammal 2022 hi_res signature|18448928050