Well, perhaps useful in keeping his trousers on, but he has no need to keep his trousers on at the moment. In fact, he has every need to have them off. He stretches out a hand to try and undo John's belt as well, but with John being half way down his body, it's a bit hard to reach.
So he settles back against the couch with a slight huff of frustration, licking at his kiss swollen lips. "I am a genius," he mumbles in response to John's statement, but the words are distracted.