"Just tell me if I'm doing it badly," Kieren insists and reaches forward to help unbutton Sirius' trousers, taking his time to enjoy the way it feels for him, the brush of fabric on hips, the tingling sensation of anticipation, and always that thread of arousal. He slides down to his knees and stares up at Sirius as he gets him out of his pants and strokes his cock, just the once, trying to fight off his nerves.

Then, he decides it's best to just go for it, and he takes Sirius deep in his mouth, unrestricted by a gag reflex as he is. Of course, the sudden bolt of experience is not planned for and his whole body nearly convulses with it.