>>255It's simple.
Kill the Batman.
Or, you send her a message hitting on her aggressively (you know her better than I would, whether outright smutty "this is what I want to do to you" would work or just 'wow you're so beautiful and we've got a lot in common".
Don't mention her being your cousin, or anything like 'I've wanted you for a long time', just wait for her response. If she seems open to it, you're in good shape.
If she gets freaked out, you now have the option of saying "Oh, shit, I opened two profiles and was going to send you a 'lol can't believe I found you here' and send the come-on to the other girl, but I must have gotten them mixed up!" or "Yeah, I was just messing around, pretending to be one of those pathetic losers… I kinda thought you'd get the joke, that's why I put a smiley face/lol at the end!" (oh yeah, put a smiley face or lol on the end, otherwise this won't work! those types of things are ambiguous and essentially meaningless, because people will do them to 'defuse the tension' if they actually hit on somebody too. it just needs to provide a good alibi.)