Kieren is one of those two things, seeing as 'growing' isn't exactly something that's going to turn up on his CV anytime soon. He gets tumbled loose unexpectedly and gives a mild cry of surprise, but it cedes to delight as he realises what they're doing. "No, this is good," he agrees, bearing down with intent as he slides both palms up the planes of Sirius' thighs, getting back to what he was doing. "Good?"