START-563 I was used as a sex toy to satisfy my husband's pent-up sexual desires. His incredibly powerful erection made me feel more pleasure than when I was with my husband... Nagisa Koisei - Nagisa Koio

I've been married for a year to my much older husband. We're living with his son and his wife from his previous marriage. The house is spacious, and we have our own privacy, so I thought I was happy... but! My stepson, who is experiencing a sexless marriage, keeps pressuring me to satisfy his sexual desires, regardless of time or place. I can't resist his thick, hard penis, which is so different from my husband's, and before I knew it, I was starting to crave it myself.