My sister took a selfie and sent it to my wife as a birthday gift.

My sister and I have been living together for a while now. I moved in with her so she can help me get a better job and whatever. She is my older sister, and I am the baby of the family. I'm 17.<br><br>My wife and I... well. She is 34. She lives with her husband. Technically, she is my wife because we are in a poly triad, and she married him and me at the same time. It was a weird ceremony because the poly triad community isn't well known or well established. Needless to say, he was happy to marry me as well since we are in a poly relationship.<br><br>All of that is important to understand because my sister is jealous of my relationship with my wife. Part of the reason why I moved in with her was because I didn't have enough money to pay for anything on my own. My wife was making good money, but it was hard for me to get a job because I just turned 17 and my wife is 34. We both agreed that I should live with my sister temporarily and establish myself in the world of employment so that way I can help her better.<br><br>I have been with my wife for two years now, and we started dating when I was 15. I know there is a massive age gap. I want to see it through until the end. I'm also autistic.<br><br>So for my wife's birthday, we wanted to get her a present that she'll never forget. We were brainstorming idea after idea, and my sister wanted to do something really special. She decided that she wanted to "take a selfie" with me for our wife as a birthday gift. I was a little skeptical because my sister isn't really into doing anything with me for my wife. My sister was serious about it and said she would be happy to do it. I thought it was a little odd.<br><br>She told me that she had an idea for the selfie. She set everything up. And when she was ready, she wanted me to take my shirt off and sit next to her on the couch. I was like, "Okay, sure? I guess?". She was being very nice, which I found very suspicious. When I sat next to her, she put her arm around me as one would for a normal selfie. But she kept her hand on my chest. I was confused, but I didn't react. I just thought it was a little awkward.<br><br>Then she leaned into me and took the selfie. She was a little too close than what I was comfortable with. I thought she would pull back afterwards, but she didn't. She leaned in closer, like, really close to me... and started kissing me. I was shocked. I didn't know what to do. I just sat there for a moment, unsure of how to react. I didn't want to get up and walk away because that would just make her mad.<br><br>The next thing I knew, her hand was down my pants. I was shocked. I never expected her to do that. She never did anything like that before. While she had her hand down my pants, she was still kissing me. I started kissing back because she smelled so good. I was just so... confused... I didn't expect any of this to happen. I never expected her to do this.<br><br>Then... we had sex. I didn't know what to make of it. Part of me wanted to stop her, but I was in shock. I didn't want to ruin the moment because I didn't want to make a big deal out of it. I didn't want to make her mad, but at the same time, I was really enjoying it. It's hard to explain. I didn't know what to do, but at the same time, I was horny, and my sister is really hot. I didn't expect her to be interested in me. I didn't think she ever looked at me like that.<br><br>I felt really bad afterwards. I wasn't sure how I should react. I had sex with my sister. I had to process that. I couldn't believe it happened. I know it's wrong and gross to some people. I don't know what to think. I'm just really confused.<br><br>The selfie was already deleted from her phone. She didn't send it to my wife for her birthday. I'm not sure what that was about, but I think it was just an excuse for her to get close to me. I'm not sure what to think. She is really attractive. She is older. She smells so good. I love her. I just... I don't know what to do. I don't want to ruin her life or mine. I just don't know how to process this.<br><br>I would love some advice on how to handle it.