[And then quickly (with maybe a little help of a blackwhip) reverses their position so that Katsuki's the one on his back and Izuku can hover over him.]

It'll be easier if we do things this way, Kacchan. That way you can relax your body and I can do most of the work. At least... That's what I read.

[There's no Internet here, so imagine Izuku trying to read up on these things... Then he reaches out to the little side table and pulls out the little bottle of lube.]