My wife and I visited her parents' house for the first time in a while. My stepmother, Ren, and my brother-in-law live there. My brother-in-law is a bit of a coward and still seems a bit out of place to me. My stepmother, meanwhile, is beautiful and voluptuous for her age, and I couldn't help but look at her with a slightly lustful eye. That night, I saw something I shouldn't have. I witnessed my stepmother giving my brother-in-law a blowjob, satisfying his sexual needs. Unable to get my mind off my brother-in-law, I headed to my mother-in-law's room in the middle of the night. I quietly assaulted her as she slept, fondling her voluptuous private parts, when she woke up. I'd seen her having sex with my brother-in-law. She wanted me to do the same. My stepmother was reluctant, but she accepted and gave me a blowjob. Unable to resist my stepmother's erotic acts, I thrust myself inside her, even though she told me not to, since she apparently hadn't had sex with my brother-in-law. An incredible pleasure enveloped me, but it seemed my stepmother was writhing in pleasure as well. I couldn't help but release my semen inside her, and she received it inside with a blissful expression. Ren's face had changed from that of a stepmother to that of a woman...