My step-mom caught me masturbating with her panties. She was amazed at what was going on, but also surprised at how much my penis had grown in such a short time. She wanted to show me more, so she had sex with me. I ejaculated inside her anus. I'd always wanted to have sex with her, but I wasn't sure where to start. I'm hoping I can keep having sex with my step-mom and her big ass.