Caught my stepsister stealing my clothes

I caught my stepsister stealing my clothes, and when she took my panties, I had to confront her. I went to her room and asked why she does this, and she tried to deny it. I showed her that all my clothes are marked, and she started begging me not to tell anyone. Seeing her feeling sorry, I decided to forgive her as long as she doesn't steal anything from me again. We hugged, and that's when things took an exciting turn. We started kissing, and I ended up having lesbian sex with my stepsister.