I want to fuck my cousin.

Me and my cousin who are the same age have always been really close since we were kids but recently I’ve just been getting so attracted to her. I always go over to her house. And most of the time like she always fully bends over infront me whenever I’m at hers idk if she’s meaning it like that or not? Whenever I’m over for the most part her mom (my aunt) is always away at work, so it’s like I could fuck her if she was down but how do I make her down yk? She also has a bf so it would be hard but does anyone have tips on how I could make her wanna fuck me or a way on how I should ask or something.