my sexy cousin
my cousin has gotten hot over two years and a while ago she lent over me and her boobs touched my legs and i got a boner over it and now every time she comes over i just want to have oral sex with her she is only just the same age as me is this normal
Only you know your family, as in (1) how she'd react if you told her your feelings, and (2) how your family would react if they found out. If you think she'd freak out, I would keep it to yourself forever, or the next few years at least. If your family would disown you if they found out, same advice. There are other girls out there. The sakes here are just too high.
Of course, if you're burning to tell here, then maybe you'll feel better if you promise yourself you'll do it sometime in the distant future... like once you're both married (to other people, of course). The you can reveal your secret, like "you know, when we were younger, I thought you were so beautiful... even had a crush on you." If you've remained friends in between, then she probably won't be too freaked out, just flattered.
On the other hand... if you think she might be hot for you, and you think your family wound't disown you if they found out, then you could always mess around alittle, I guess. But for god sakes wear a rubber! If you get her pregnant, your baby will have 3 eyes.