Masturbating

Gwen is on the bed, naked from the waist down. Her legs are spread wide, with her right hand hard at work between them. She's angled and positioned on the bed in such a way that... well... let's just say she could hardly have given you more of an eyeful if she tried.

Given her initial response to seeing you and Allison a moment ago, and how much of a hurry she was in to get into the bedroom, and most of all the suspiciously locked door, you probably should have seen this coming. Given the fact that she can clearly see you and Allison in the doorway but she hasn't even slowed down, you're probably about to see her coming.

It's that last thought that snaps you out of your momentary trance. You pointedly avert your eyes. You don't want to watch your own sister bring herself off... do you? There's apart of you that does want to watch, or better yet to help her out. But that's just the curse talking... right? One thing's for sure, though: you're going to need one of those spare pairs of panties a lot sooner than you expected.

Gwen does indeed orgasm, though it doesn't sound like a particularly satisfying one. You probably interrupted her at the worst possible moment, at least from her perspective: right on the verge of her climax.

Your eyes remain fixed on the point on top of the bookshelf. You realize suddenly that the point in question happens to be occupied by a box set of dvds you bought Allison last Christmas. It's still in the original plastic wrapping.

Figuring you've given Gwen enough time, you turn back towards the bedroom. Unfortunately, it seems she hasn't made any attempt to cover herself, or even moved at all. In fact, it looks like she and Allison have just been staring at each other. Returning your gaze, she finally closes her legs at least and sits up in the bed. Then she turns her eyes back to Allison, looking sheepish. "Um... Sorry?"