It took Severus less than five seconds to decide-- five very long seconds, broken by biting his lower lip to stifle an embarrassing whimper-- and he leaned in for another brief kiss.
Pulling away, Severus continued to stroke the other boy while he stared down at Regulus. Grey eyes gazed back at him, certain but apprehensive. At least neither of them knew what they were doing, not really.
"I don't think hard, long, and fast is really the way to go about it the first time," Severus remarked, trying for dry but settling for slightly breathless. "The last thing I need is for you to be wandering about with a sore arse tomorrow, and leaving me to deal with your parents wondering just how, precisely, I've managed to hurt their darling boy in such a way."
Severus swallowed convulsively and sat back, watching the tip of his finger prodding the tight muscle. There was no way he'd fit without hurting Regulus.