No Big Deal by S. M. James

Angus Reid has always hoped for a roommate.
As the only openly gay student at Pinebrook Private, he’s never had the kind of friendship everyone else in his year does, until Tyler shows up. Tyler is sweet, thoughtful, and absolutely adorkable—and better still, he couldn’t care less that Angus is gay.
Unfortunately, falling for your straight roommate is never a good idea, and during a snowed-in weekend, Angus learns this lesson the hard way.