I think you've answered your own question. You clearly feel comfortable with your cousin, and isn't it natural to want sex with someone with whom you feel comforatble and you trust? Easy in dreams, of course, but I guess problems start in the real world where you would face a moral dilemma if you started thinking sexually about your cousin. Is it an incestuous thought or not? It's legal and it happens not infrequently but who is to say? You are hiding it from your family (in the dream) presumably because of the guilt associated with it.

Are you wondering what to do with the dream? I guess it sounds confusing for you. In fact I would suggest welcoming the dream, because it shows you what sort of relationship you are looking for in a lover. Further, remembering that this isn't really your cousin but only something your mind has conjured up in a dream, you have got in touch with your "inner lover". By that I mean the feeling, not the person in the dream. And people in real life never quite match up to our inner lover anyway.

Maybe you will find it easier now to let go of your need to have guys wanting you now that you know the feeling driving that comes from within and can only really be satisfied from within. You will then be able to see people more for who they are rather than for what you want them to be.

(sighs) Wouldn't the world be a much happier place if everyone managed to do that?