I feel like we talk about Bucky’s first time having sex after being freed from HYDRA all the time, but like Steve was also frozen for multiple decades and he had even less experience beforehand
Like imagine you’re there to try to help him get reintegrated into modern life. Introduce him to new things, explain the history that he missed, and really just find himself in this strange and new world.
Maybe you’re sitting in your apartment late at night and asking him about his time pre-capsicle, y’know?
Maybe he mentions that he didn’t have much experience and how he felt about Bucky’s clear charms. Maybe he talks about how weird it was to have ladies look at him after the serum.
Maybe you make a casual joke about sex that makes Steve pause and his brain short-circuit for a second.
So now, you’re left explaining that sex isn’t some taboo thing and it’s not considered as inappropriate to talk about publicly as it was back then (even though there were definitely some freaks back then, don’t let people lie to you). You even apologize if it made him uncomfortable. The guy is still adjusting to this time period and you’re trying to explain sex culture to him. Not exactly a normal conversation topic for him.
Your attempt to apologize somehow ends up more like you word-vomiting about your kinks to Captain America as you explain the difference in how sex is discussed now. He’s stunned into silence. Still visible cool and collected like his always is, but not able to form a full coherent thought.
There’s a lull in conversation before he asks how you found out what you liked. You then have the choice between lying or explaining porn to Steve’s face.
You somehow choose to explain porn and experimenting with partners. He seems worried at the idea of sex changing so much from what he had learned and experienced before the ice. You make a joke about being willing to let him experiment with you so he doesn’t have to find a random person to be comfortable with. He asks if you’re serious or not and you realize that you may have been joking a few seconds ago but now you’re painfully certain.
Long story short, you end up jerking him off while sitting on his thigh. He pants and moans and you suddenly have the first avenger turning to putty in your hands. His orgasm comes far early that he wants it to but you just whisper how happy you are that he felt comfortable with you. How happy you were to make him feel good.
And when asks about you, you just say that you both can worry about that next time as you go to wash your hands.
And then you two start experimenting with a fuck ton of kinks. Steve is just as eager to learn as you are to teach.
Note: might actually write this now. kinda fell in love with the idea as I kept talking about it.