That he was going to die later on -- at all, or without this, or whatever other option was in between -- wasn't really something on Tony's mind. Not right now. He didn't want to taint this with what might be even if it was sort of what had spurned it on in the first place. He knew Steve was sad, and probably would continue to be, but right now he just didn't want it to be relevant.
He wanted to be lost in the moment, not the past or the future.
Anything felt like an awfully big promise, but the way it came off of Steve's lips, Tony was inclined to believe him. "Yeah," he said, approving, agreeing, he didn't really know. But Steve lifting him somewhat urged Tony on and he rolled his hips a little, trying to get back to that sweet spot even though just feeling Steve in him was just as fucking good, same as his own cock trapped between them felt good.
"Gonna leave bruises," he murmured, biting playfully at the soft curve of Steve's neck even though no mark he made would last long at all. "Make sure I remember?" As if Tony was going to forget this anyway. But he'd never be opposed to some manhandling anyway.