Could a guy get hard by this?

[Anonymous]

So we were watching a movie with a guy friend of mine and he hugged me and cuddled with me. At one point I started caressing his arm and he suddenly told me to stop. He seemed nervous but not angry though... Is it possible that he got a boner or he didn't like it? is it possible for a guy to get a boner simply by that?

[Anonymous]

he should be having a boner since you were there