Help?

I'm trying to write something, and what I really need is some examples of a long drawn out penetrative sex scene. Does anyone have any fic recs with something like that in there? Any fandom, any slash pairing will do. I'm not going to plagiarize anything, obviously - I'll work out a way to kick myself in the face before I do anything like that - I just would like a sense of what to concentrate on, how to make it seem like it lasts longer than it takes to read the sentences, if that makes sense? If anyone could help me out, I would greatly appreciate it! ♥