It's all Sirius can do to remain standing, every muscle in his body coiling tight as Kieren's mouth works over him. And then Kieren is pulling back and off and Sirius gasps, the tension under his skin unspooling as he stares down at him.

"Oh," he breathes before letting out a quiet, hushed laugh, and nodding. "Yes, of course. Just, please--"

And Kieren does, ducking once more to take Sirius into his mouth, tongue swirling over the tip, taking his time as Sirius shivers above him. Sirius again runs a hand up his stomach and chest, touching himself the way he'd love to touch Kieren, fingertips passing over one nipple as his hips rock forward.