With a soft sigh, he soon hardens in Leon's grip- he knows he's not small, so he wonders how far Leon could take him. He isn't cruel enough to force him to take more than he can, but the feel of Leon's tongue along his length certainly has him thinking about it.

"Don't finish me this way... I would see us both content by the end of this."

That's his only request, as long as Leon is okay with it. There is lubricant here after all. Hythlodaeus wouldn't even have to conjure it! And this way, Leon isn't left with a painful erection on top of everything else.