We were given a warm welcome in the hotel. It was a beautiful beach resort in south Goa. The check in was quick.Our room was so big and beautiful! I c...ouldn’t take my eyes of it. It was a private cottage. The bathroom was also very big with a bathtub and separate shower area. Since she was working with the same chain of hotels, she had ensured that we get one of the best rooms in the hotel at the least possible price. We both hadn’t slept well last night and were feeling very sleepy.We freshened. I put a hand on her shoulder, I said I would stay but I had to meet my girlfriend. She put her hand on mine. “It's fine, don't be stupid. I'm a big girl. My mates are coming round soon anyway” she said, looking up with those eyes again. Call me an arsehole, but something about a girls vulnerable, eyes, watery, fighting back a tear, gets my cock twitching.My hand had been lingering on her shoulder and she didn't seem to mind, in fact, her hand was lingering on mine...“You know what, I've got. It’s your body trying to persuade you to do it more often, so you can pass your genes along.”“So what does that have to do with Mom not having a choice.”“My hypothesis is that much like your saliva having a smaller effect than blood or semen, there is some other mechanism that has a smaller, but not unimportant, affect as well. Think of it like stages, each leading to the next to make it possible for your genetics to pass on. We know the effect of stage one alteration, at least anecdotally. In. ”“Do you know what else you could do for your brother?”“What?”“You’d do anything, wouldn’t you?”There was a pause, and I realized that I’d gotten carried away. I was hard as a rock at the sight of my panting sister, practically getting off just at the idea of making my bed in the morning.“As long as it wasn’t incest.”“Yes.”“Say that you’d do anything for your brother, as long as it wasn’t incest.”“I’d do anything for my brother, as long as it wasn’t incest.”“One thing you could do for your.