Hi, I'm looking for a fic that I fear may have been deleted, since my searching has left me emptyhanded. It's starts with Steve and Tony in a cell, having been kidnapped, and they realize that a gas is being pumped in and drugging them. Then they are rescued, but by that point the drug has left them with a sort of feral, animalistic behavior and Tony is worse off than Steve since he has the serum. The bulk of the fic is the drug wearing off of them as they display territorial and animal behaviors. I remember at one point they hide together in a pillow fort and when they are rescued they have to be convinced to get inside the jet and Steve plays catch with someone, I think Clint. The team watches over them once they get back to somewhere safe. I pretty sure it's established Steve/Tony. Thanks so much!
Sounds like you're looking for "Terrible idea" by MountainRose and szzzt!
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On AO3: https://archiveofourown.org/works/5350076