Sulu was too distracted by Ianto's mouth on his to realize they were falling until it was too late - even when he put a hand out to stabilize himself, Ianto had already knocked his head against the armrest. Irrational panic flared up for just a split second, but he just laughed it away, practically giggling into Ianto's mouth as the hit jarred him.

"Good job," he managed to say, already bringing both hands up to either side of Ianto's face, steadying himself on his knees as he kissed the other, taking advantage of Ianto's moment of weakness.