Any other time - literally any other time - Steve would have picked up on that statement. He would have wondered what Bucky meant by that: that he'd been doing some reading. Because surely, he'd said it for a reason. Surely he was implying something with that comment..
But Steve was just too far gone. He couldn't focus, couldn't breathe. All he wanted was to shove his cock into the tight, welcoming heat of his boyfriend's ass without even considering the emotional side of all of this. He'd regret it later. Not the sex, of course. Unquestionably, not the sex. He would simply wish he had taken the time to appreciate what was happening and the significance behind it.
Instead, he was much more focused on the other thing Bucky had said. Steve had lined himself up, the feeling of his tip brushing against that puckered skin enough to send shocks throughout his body. And, without even trying, Bucky would succeed in making him see stars. All Steve had done was push himself through, just halfway, and the blonde was already having trouble maintaining a grip on himself.
"Bucky," he breathlessly whispered, suddenly very much unable to control himself. He pushed himself deeper, a moan rising from his lungs. His hands came to hold his boyfriend down against the mattress, his hips pulling back only to shove forward again, now with greater force. "Fuck."