I had a high-school sweetheart that I dated from when I was 15 until I was 24. We split up because of various stupid things, but we've done our best to remain friends. A few months ago my boyfriend of a year proposed, and I said yes. I was happy. I received a message on facebook a few nights later from my ex congratulating me. He offered to take us somewhere to celebrate, but my fiancé didn't want to go. He assured me he trusted me and that it was fine if I went.

It was a beautiful day so we went to the beach. We talked about our lives and how we were doing. We sat on the beach at the edge of the water and had a great time chatting. Everything was great.

On the way back, we had a flat on a lonely stretch of old desert highway. I pulled over in a tizzy and he assured me it was no big deal. We got out, both still wearing our bathing suits, and he went to work changing the tire. I stood next to him watching, and he made a funny joke. We both laughed, and then suddenly I felt his hands on my thighs. Everything in me felt like electric shock, and suddenly he had my bathing suit bottom yanked to the side and was eating my pussy. It felt like heaven. He spread me open with his fingers and sucked my clit.

It was all a blur, but I climbed up on the hood and he stood between my legs. He pulled the bathing suit aside and shoved his dick into me. It was so long and thick and it was definitely bigger than my fiancés, and he fucked with a passion we'd learned from each other as horny teenagers. He yanked my top off and gripped my tips while he fucked me, and I was so horny I came just like that, which is rare. He didn't pull out, either. Just as I was moaning and writhing on the hood of the car, I felt him shoot inside of me. He collapsed on top of me and pumped me full of his cum. It felt amazing.

We ended up back at his place and showered together. As soon as we were out he carried me to bed and we spent the rest of the night fooling around, fucking, and cuddling. The next morning I was home before my fiancé even called, and by the time he came by he had no idea I'd been out all night. I suddenly felt completely guilty, but repulsed by my fiancé.

I don't know what to do. I'm not sure if I want my ex or if I'm just into fucking him. I know I can't marry this innocent man with such a secret, but I'm afraid of telling him.