I'm attracted to my ( way ) younger cousin, is it normal?

Am I just messed up or is this normal? I have a younger cousin who's extremely attractive, I've been fantasising about him for so long, but I don't want to act on it, but the temptation is real.
He has male model facial features, and believe me, he's probably one of the sexiest humans to ever walk this planet lol.
And the way he dresses... pure class! And I think I might have a crush on him, and I find it awkward, I'm 33 and I shouldn't feel this way about a 18 year old guy, should I? My son is almost his age... every time I see my cousin all I think is sex, sex, sex. The other day he came over to me because my son wanted to see him, but my son was late, so he waited for him at my place and we were alone. He had a hardon and I couldn't help but look at it, and he caught me staring, I just played it cool and pretended I was staring into space, that was awkward! I think he knows how much I like him, and I think he likes me, I'm pretty and he does stare, but I get the impression he knows this is wrong, we like each other so much but both know that it would be a complete mistake.