Starting from the beginning I was chilling with some friends and we got to thinking back to our Senior Prom last year. My buddy took his lady friend who happens to be our friend's sister. She is ridiculously hot and doesn't really remember me.

So I decided to sent her a FR that said " You're Dan's sister right?"
She replies with "well yes i am why?"

I figured I would of course tell her we were thinking about prom yesterday, but I'm not sure how to build that into attraction.

I am very AFC right now and I am up to my ears in seduction literature, but I do feel if I can get a first meeting I will have her hooked because my in person game is very strong.

Any suggestions on where I can start to go with it.

BECAUSE I WAS THINKING OF YOU, THE OTHER DAY. SO I DECIDED TO LOOK YOU UP!
sorry for screaming. lol
deal with it.

The way you phrase it makes this alittle bit of a challenge.

Problem: You said "Your Dans sister right?" Sounds like your trying to get into contact with Dan and your using his sister as a medium. But that ok, we can fix it...hopefully.

Solution: "Whats he been up to I haven't seen him in awhile." Blah Blah Blah. "Cool, I bet hes still ____" yaa as always "something about her"

Ok so the looking her up worked and she sent a reply in the early am hours, so I teased her about being a night owl. She said yea I don't like sleeping at night. I was thinking of sending her back:

I usually run 4 or 5 myself just because I started staying up later and later, next thing you know I'll skip a day. So what have you been up to (cutie or ?)?

Also she has not accepted my friend request yet, but also has not denied it. Any ideas how I can ask her to accept it so I can get some info on her for some common ground?

fluff for a few more messages before you submit any kind of ioi's...i dont know how long its been since you last saw her and she might think it kind of weird. but later on, you could say something like "youve gotten very pretty/cute/whatever since i last remember you."