His clumsy attempts at unfastening Kieren's trousers are quickly aborted when Kieren succeeds in undoing Sirius's first, cool hands slipping beneath the waistband and shoving the fabric down to Sirius's mid thighs. Kieren is suddenly already on his knees. Every bit of blood in Sirius's body seems to rush south and he sways forward, balancing himself unsteadily on Kieren's shoulder for a moment before his fingers slide into the hair at the nape of his neck.

There's a hand already curled around him, stroking him from base to tip and he shudders immediately, breath catching half a second later when he feels Kieren's mouth on him instead, a wetness sliding down clear to the root.

"Kieren." It nearly comes out a yelp, legs shaking as his fingers clumsily slip up Kieren's smooth cheek. He manages to keep himself from rocking forward though just barely. "Merlin, that's-- that's good. That's... shit, it's so good."