My cock twitched as, for the first time ever, I saw my big sis in a sexual light and I couldn’t believe how hot she was. Throughout my whole sh...wer, all I could think about was her round ass being swallowed by that tiny thong. I imagined that I went to give her a boost and was able to run my hands “accidentally” up her smooth legs and cup one of her round cheeks. I couldn’t help but stroke my cock to the image of her face when I grabbed her ass tight and didn’t let go. And pulling that. She didn't start crying again at least.I went back over to my chair and watched the dumb show I had on been watching on the TV, waiting to see if Mabel was going to explain what she wanted up here. If not, I was going to text the special number that would alert Steve's security people to come up here. They would find out what was up with her somewhere other than here in my room.During a commercial, she moved over to sit next to me on my bed. When I looked over at her I saw she had her knees up. I don't even have anyone to call right now because everyone left me. Her thoughts were interrupted by a gentle knock on the door.Heather, David's girlfriend walked in the room and asked " Do you know where David is?" "Umm I think he's at work right now, but I have a question to ask." Melanie thought as she came up with a great idea. "What would you do if you did something wrong and everyone you know abandoned you and your lover left you?" Oh this is about the stealing thing isn't it Melanie?". I could not take this incredible, delightful argument any longer. “Oh god Nadia my answer is cumming!” Nadia gave my shaft a few more strokes with her hand and then with perfect timing she released my cock, taking it all the way into her mouth. At that moment I exploded, pumping my cum load into her mouth and down her throat.I could feel spurt after spurt of my thick cum surge out of my cock hitting the back of my fiancés throat and I could feel her swallowing as fast as she could. I kept.