Am I attracted to my girlfriends cousin?

I'm 30 and my girlfriend is 25. Her 18 year old cousin moved in with us twelve months ago and I find everything about her delightful.

Her scent is intoxicating, everything she says seems to make sense to me and she is easy going enough to wear very short shorts around the house.

My question would be; is it wrong to find my girlfriends cousin attractive? What would you do in my situation?
Am I attracted to my girlfriends cousin?
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