My stepsister left her panties behind, and I didn't even know what it would lead to

My sister forgot her underpants for so long.

Well, my sister's not home right now, so I think I'm gonna be able to jerk them off because I've been wanting to do this for so long.

I like my sister so much, and I wish I could make it work with her, but I don't think it's possible,.

Because I'm her half-brother, and that's just not right.

What are you doing here?