I'm using my best friend's cousin
What are you using your cousin's best friend for?
I want to get closer to her to hook up with someone
Using your bf's cousin to get to your bf is exploitation. If you want to hook up with your bf, just be straight about it.
LOL you are so uptight.
You were the one asking for advice.   If you use these tactics to get someone, it could get around and hurt your overall reputation.