Legal Question in Criminal Law in Michigan

Not with your first cousin under any circumstances. Otherwise you can legally, provided they are at least 16 years old, you are not an authority figure over them (ex. teacher, coach), and they have the mental capacity to consent.

However, just because something is legal doesn't necessarily mean it is right. Always weigh the consequences of anything before moving forward.

Have you asked him whether he wants to have sex with you?

"Can" you have sex with your cousin? Yes. "MAY" you have sex with your cousin? No, if you and your cousin are related by blood ("consanguinity") or marriage ("affinity") to the third degree.