Ianto hummed in response to Sulu's increased pace, working his own hand to try and match Sulu's tempo, unable to help a little rock of his hips every now and then. He deepened their kiss with Sulu, before pulling back and moving to bite the other man's lower lip gently, then going back to kissing him again. His hand cupping Sulu's cheek moved around to the back of his head to thread through his hair, his nails scraping Sulu's scalp as he did so. He knew that Sulu liked things like that, after all, and he liked getting favorable reactions out of Sulu there.