Kieren's fingers never stop, pumping into him slow and deep, making every muscle in Sirius's body wind tighter and tighter. He grips at the sheets, meeting ever slide of those long, amazing fingers, hips tilted upward as he sneaks a hand down to cup himself carefully, pressing into his hand instead of the sheets.

"Like what?" he asks on a soft, breathless gasp. "Like being buggered?"

It's a crude word, maybe. But it gets the point across. Sirius himself has never felt this either, though he isn't sure that's what Kieren meant at all.