"Well I don't have that yet, so be gentle with me."
Derek braces his hands against the bed to hold himself a little bit above Stiles, conscious of how much bigger he is than his -- well, he guesses his boyfriend. Not that he's that much taller, just that Stiles is more slimly built, and Derek is usually a little self conscious about how broad he is, anyway.
But their hips still press together as they kiss, and Derek finds himself whining softly as Stiles moves against him.