I came to visit my long-desired girlfriend Ai-chan's house. Attracted by her lovely voice, I took a peek and found my big-breasted sister Fumika practicing a play! When I was troubled by her cleavage, she asked, "You've been looking at me all this time, haven't you?" and "Do you want to touch me?" She couldn't resist tempting me...! My cock was sandwiched between Ai-chan's soft, heavy big breasts, which were incomparable to hers, and I immediately ejaculated! In a place where my girlfriend couldn't see, she gave me a blowjob, breast-feeding handjob, and had sex with her boobs shaking, making me cum over and over again! Even though I knew it was wrong, the feel of her big breasts was just too good...