If your girlfriend and your mother swapped bodies, and the only way to reverse this was to sleep with one of them, who would you choose and why?

Having extremely youthful beautiful mother doesn't mean it's easy to do it.
what the hell you think it's that kind of hentai? I don't have such fetish

These fellas are my OCs by the way. I really should write a story about them.
Actually I already did, a lot, stash of them even, but never published them because it's really corny and stupid. I really don't have a knack on writing.