Jack and Daniel turned into cavemen?

[flashwitch.livejournal.com]

So, I was reading a Steve/Tony avengers story (Terrible Idea by MountainRose and szzzt on AO3) which featured the two guys being drugged which causes them to become 'feral' or like cavemen. It kept reminding me of a story which had the same idea with Jack/Daniel. I remember they weren't in a relationship already but had sex while regressed which lead to discussions about consent and emotions. I think there was some random woman in the lab/cell with them and there was a question about why neither of them had sex with her.
I would be very grateful if this sparked any memories!