Mirei is Mika's younger sister, the three of us have played together since we were kids. But when I grew up, I rarely had the chance to meet Mirei, but I often met Mika because I was in the same class. Some time later, Mika and I decided to go on a date. When I went to my lover's house to visit, I met Mirei again. It's not like it's been a long time since we've seen each other, but every time I see Mirei, she seems to become more attractive. Especially the pair of big breasts in front of my chest seemed to appear before my eyes! Those white, big and round breasts made me unable to take my eyes off them! Knowing that I was attracted to her breasts, Mirei even deliberately dressed more revealingly to seduce me! Actually, Mirei has liked me for a long time, but now seeing Mika and I dating made Mirei jealous so she decided to win me over. Even though her sister was nearby, Mirei still seduced me by rubbing her breasts against me, letting me feel the softness and elasticity of her breasts. Even though my mouth kept saying "no", my cock said the opposite. Even though I know I'm sorry for Mika, I can't resist her too sexy sister!