This may not have been their first kiss - far from it - but it certainly felt like it. Something was different. In a good way. It felt free and happy. And god, how it made Zemo's heart beat wildly in his chest. He couldn't help but focus on how warm Bucky's lips were against his own; how that hand felt on the back of his neck, how eager Bucky was in return.
Zemo wanted to keep kissing him. Wanted to do a hell of a lot more than just kiss him. But the baron soon found himself to be conflicted. He knew Bucky was emotionally vulnerable right now and honestly, Zemo knew he'd feel guilty for pushing for more. Just because he could did not mean that he should. Bucky might even hold it against him later, for taking advantage of him while he was like this.
Not to mention, they had waited this long. A few more days or even weeks wasn't going to kill him. Zemo didn't need to get off. If Bucky just wanted to crawl back into bed and smooch and cuddle, the baron would be more than okay with that.
..but at the same time, if Bucky was going to strip that robe off of him and have his way with him as a coping mechanism, Zemo wasn't exactly going to tell him no, either. He leaned to the side, whispering into Bucky's ear, "I'm going to keep taking if you keep letting me, James."