Each time Sirius said his name, Severus relaxed just a little more. Oh, he knew what was going on. Sirius was trying to cow him. And, damn it, it was working. Severus rocked slightly with the gentle thrusts of fingers that he never assumed to attempt such things. The warm breath on his back, the tender kisses, the sensual, moan inducing bites and the sudden charge of electricity that ran through him was off putting.

That same charge happened again. And again. And again. Severus's toes dug into the soles of his shoes as he yelped. That wasn't pain, just lust. Whatever Sirius was hitting, it was making him hard again, causing his cock to twitch and jump upwards against his belly.

"Aah!" It was that sweet spot, one he never knew he had, that left him panting and no longer arguing about what Sirius was or wasn't meant to do.