I figure it wouldn't take long for Steve to catch on, or at least guess. If Bucky's got all these weirdly-specific berserk buttons about certain sex acts or intimate gestures, there are only so many alternate explanations Steve can come up with before it turns into willful denial. But he doesn't press the issue, and Bucky sure isn't volunteering anything, so it turns into the elephant in the room. Steve knows, Bucky probably suspects that Steve's figured it out, but neither of them wants to have that conversation. (Clearly more violent sex is the answer. Duh.)
Re: Steve/Bucky, Bucky likes being in control
I figure it wouldn't take long for Steve to catch on, or at least guess. If Bucky's got all these weirdly-specific berserk buttons about certain sex acts or intimate gestures, there are only so many alternate explanations Steve can come up with before it turns into willful denial. But he doesn't press the issue, and Bucky sure isn't volunteering anything, so it turns into the elephant in the room. Steve knows, Bucky probably suspects that Steve's figured it out, but neither of them wants to have that conversation. (Clearly more violent sex is the answer. Duh.)