Severus smirked and crawled up the length of the other boy's body. Bracing himself on his elbows and letting his own erection brush against his lover's stomach, he leaned down for a slow, languid kiss.
"I was thinking," Severus murmured between swipes of his tongue, "That I'd like to wrap my lips around you and tease you until you beg me to stop, and then tease you some more, until you beg me not to stop."
Lowering himself until their bodies were pressed together, he brought the other boy's hand to his mouth and sucked on two fingertips to demonstrate.