MDTM-043 — My Anus Feels Good As It Widens... "I'll Do Anything For You, Big Brother..." Little Sister Yuu

It's been a year since my sister and I started having a relationship... I used to bully her a lot, but she couldn't help but be happy about it. After we discovered sex, we started having sex on a daily basis. The sexual desires of adolescence are intense, and our sexual activities escalated rapidly. So I decided to try anal sex, which I'd always been interested in, with my sister...