[Coffee.]

Sexuality is not black and white. Identity is also different than sexual activity. He may be attracted to girls to a small extent. He also may have been thinking of men at the time he became erect. And last, he's also a teenage boy...teenage boys get erections a lot, often when they do not mean to. It's a very complicated matter, and we cannot answer that, only he can. However, I'd recommend that if this activity makes you or him uncomfortable, you stop. I'd even double check with him to make sure he's okay with this type of cuddling activity. It's always better to double check.