Zach hadn't really...tried to talk to Colin that much about sexual matters since his horrible explanations had crashed and burned. Really, showing was so much easier than telling for Zach. Colin hadn't seemed to complain, and Colin mentioned regularly being able to see things and...stuff. And Zach had no idea if it applied in this kind of case as well. After all, his body reacted instantly to certain kinds of things, such as being told what to do.
The slight roughness contrasted the sweetness of the rest of it in a bloody brilliant way, and Zach began to pull the boxers away, to give his hand more room, and his hand slid down the skin smoothly, though one finger hooked over the top. Zach kissed Colin back, his mouth opening immediately for him.