Friends with Benefits

Bella and Edward have been friends for as long as they could remember. They grew up together, went to college together and now, live in the same apartment, saving money on rent. Bella was just dumped by her boyfriend, Paul and Edward had been single for a long time.

One night, Edward drunkenly tells Bella that he's horny and lonely. Bella, being the good friend that she is and drunker than a skunk, offers to fuck that horniness out of him. They ended up having sex.
Awkward morning after follows...

Out of everyone they'd been with, Edward and Bella admit that they are really compatible with each other, but a relationship between the two just can't work because of their history and need to stay friends. So, they decide to become friends with benefits...

What happens when one realizes that they want more??