Step cousins a step to close?

It wont probably end well. It might be puppy love, like the other answers, then again it might not. Im assuming it isnt. She is you STEP cousin, so maybe it could happen. But just as anyother girl you might like in the future, it wont work out if she doesnt like you back. You should keep talking to her and see what happens. If it doesnt work out, you will get over it. Even though it always seems like you will never get over her, you will, eventually.