Depends, Are they together?<br />
If not, talk to your cousin and find out if their is anything there, and if not ask them would it bother them if you decided to screw her. I mean you do not want any problems with your family so that is my opinion, and that is what I would do.. But whatever you do Best of luck!
Yes, then call up your cousin and brag about it. That way you can **** them both over.