Fortunately, Justin's cock thought Brian was behaving in a completely appropriate manner and had begun to stir of it's own accord.
rotf.

His hand moved faster and Justin's head fell back, his eyes closed, biting his lip. His hips pumping up into Brian's hand. Once. Twice. And then his jaw fell open, releasing a strangled cry as hot come soaked his black cotton briefs and the long fingers wrapped around his cock.
This made me clench in such a good way.

This was hot, funny and really makes me want to go to a museum. ;)