My wife and I always spend Thanksgiving at my sister-in-law's and the whole family comes to celebrate. For years, my wife and I had been having issues with my performance. I even considered seeing a doctor about my condition. We got to my sister-in-law's, had dinner, and relaxed that evening. It was soon time for hitting the sack and we went to bed. About midnight, I got thirsty and went downstairs for a drink of water. I was wearing boxer underwear which could pretty much pass for shorts and a tee shirt. To my surprise, my sister-in-law was still cleaning in the kitchen after all this time. She's always been a neat person, but I thought that was too much! As I walked into the kitchen, she turned to see me and looked exhausted at this point. I raved about how clean her kitchen was and remarked that she shouldn't kill herself like that, making everything so nice for us. She shrugged as if to say it was her pleasure. I pulled her into a gentle hug and patted her on the back. It was a long lingering hug and much to my surprise, something stirred that I did not expect. She felt so warm and soft to the touch. I've always thought my sister-in-law was a beautiful girl, but never had I had such feelings of desire. I suddenly became so nervous, not knowing what to do. I realized that my groin was pressed against her and was quickly becoming excited. I wanted to pull away for fear of embarrassment if she noticed and wasn't receptive, but it had been so long since I had that feeling, it was too hard to resist. In no time, I was fully ready in my shorts and pressing against her. At that point, I decided to commit so I slid my hands down her back to her butt and enjoyed a nice massage. She murmured a breathy, "Oh, Rich." I was now lost to my desires as I pushed my hands down the back of her pants and squeezed her, working her into a pant. She leaned back to look at me as if to say, "What are you doing?" but it only resulted in my kissing her deeply. We wound up having sex in her basement and now I can't stop thinking how horrible I am. Even worse, I want more!