big o pants, fio-chan (big o pants), original, commentary request, 1girl, all fours, animal ears, bird ears, bird legs, bird tail, blush, bouncing breasts, breasts, brown feathers, brown wings, feather fingers, feathers, hand on another's ass, harpy, heavy breathing, implied sex, large breasts, long hair, monster girl, nipples, no lineart, open mouth, red eyes, red hair, sex, sex from behind, solo focus, tail, tan, tanline, winged arms, wings