idolmaster, idolmaster cinderella girls, fukuyama mai, metalzigzag, motoi hiroumi, censored, 1:1 aspect ratio, animated, animated gif, 1boy, 1girl, black hair, blush, ejaculation, eyes closed, hetero, knees on chest, loli, long hair, lying, nakadashi, navel, nipples, nude, on back, open mouth, penis, pettanko, ponytail, pussy juice, semen, sex, size difference, solo focus, spread legs, stomach bulge, sweat, tied hair, vagina, vaginal