I wonder if Dex would reciprocate? If she accepts his "monster" within, why not?
I went to junior high school with a couple of dudes each with totally hot sisters. One was related by birth, the other adopted.
The adopted brother found the idea of all his friends ogling over his sister irritating, and regardless of their non-blood relation, he found all the requests at seeing her in the shower nude (to report on her breasts without Chip & Pepper getting in the way) repugnant.
The other dude often voiced his opinion that were he not blood related, he would have absolutely nailed his sister.
Anyway... not useful info maybe but I thought it was interesting considering the trajectory of the current Dexter storyline. Unexpected is almost always a good thing.