let's la go! bokura no jiyuu kenkyuu
yamakawa koudai, yamakawa kumi
mame
1boy, 1girl, age difference, breasts, brother and sister, brown eyes, brown hair, censored, condom, condom wrapper, copyright name, hetero, incest, indoors, looking up, medium breasts, mosaic censoring, navel, nipples, nude, onee-shota, open mouth, penis, pov, shota, siblings, solo focus, standing, yellow eyes
game cg, photoshop (medium)