No, Mr. Bond, I Expect You to Pine (слэш)

"Agent Rogers. We have to stop meeting like this." The Winter Soldier crouched in front of where Steve was slumped against the wall, hands and forearms glued to the stone behind him by some kind of sticky polymer. "Comfortable?"
"No," Steve lied. "My blood circulation has been cut off. I've lost all feeling in my hands."
"Oh, so I should probably cut you loose," the Soldier deadpanned.
"It's a medical emergency. You don't want to be responsible for me losing limbs, do you?"
"Tell you what, if you lose your hands, I'll make you some new ones." He held up his metal hand, smallest finger crooked. “Pinkie promise.”
 
Secret Agent adversaries-to-lovers AU where the Winter Soldier keeps tying Captain America to walls and sticking around to chat. Shut up, Natasha, it’s not flirting, okay? (It’s definitely flirting.)