Alrighty, so here's the deal. The past three months or so, we've all been hanging out together. When I say "we all," I mean myself, my best friend, my other good friend, my best friend's girlfriend, and my best friend's sister. His sister is 22 or 23 (I don't know why I don't remember), and has an 8 month old son. Well, I've started falling for her. A month or so back, I started looking at her a different way. We started talking all the time when we were hanging out, and just generally had fun. Wasn't sure what to do, so I kind of put it out my mind. However, it all came back this past week. We were texting each other a few times during the week. Her good friend was having a party on Saturday night, so we all went over there. We were all just having a good time talking and what not. Towards the end of the night, it got a little....good, I guess. Everyone was dancing, and I ended up dancing with her. Just kind of "grinding" away, right in front of her brother. I would have felt bad, but he was pushing for me to go dance with her, which was a little weird. She would always grab my arms and wrap them around her. Just, everything was kind of weird. In between dancing, we would be standing off the side or standing outside, and she'd walk up and take my arm and put it around her, and she would wrap her arms around me. Again, in front of her brother. After we were dancing once, we started holding hands for a little bit. Overall, it was just really, really weird, and it brought back all the emotions of before and heightened them. When we were talking, I was having fun talking to her. When we were dancing, I was having fun with her. Keep in mind, I never, ever dance, yet I did with her and had no problem. I felt incredibly comfortable when we were hugging or she was hugging me. I honestly don't know what to do. She was on my mind all day yesterday, and again today she's been on my mind. I really tempted to call her or something and see if she wants to go to lunch tomorrow, or wait and see about going to lunch on Thursday, just something easy. Then again, she's my best friend's sister. Granted, it's his older sister, so that's a little better, but it'd still be weird. I don't think he'd have a problem with it, I'm not a guy that fucks over a girl, but then again, what if he doesn't. What if he gets pissed off at me even bringing it up? I don't know. Any advice would be much appreciated. I don't want to miss this chance, if there is one, but then again, it is my best friend's sister. I think a friendship with him is a lot more important than my wants. Cliffs: Falling for best friend's sister, went to party and hit it off big time with her, she showed a lot of interest, don't know what to do.