anthro anthrofied black_and_white breasts bruce_ironstaunch cum cum_in_pussy cum_inside equine female friendship_is_magic greyscale hair hattonslayden hooves horn horngasm horse human human_on_anthro interspecies magic male mammal monochrome my_little_pony nipples on_top penetration penis plain_background pony pussy reverse_cowgirl_position sex straight twilight_sparkle_(mlp) uncanny_resemblance unicorn unknown_artist vaginal vaginal_penetration watermark