For a canon based fic, which headcanon do you prefer–that the serum makes Steve super tight, needing bucky to be patient as he opens him up again each time, no matter how much or how recently they’ve done stuff. Or the opposite–after the first couple times, Steve’s body learned to relax and take bucky at any time, with hardly any prep, he can just slide inside. Both ideas are delicious in their own ways, so I was wondering which you prefer?