It made Zemo's heart ache to hear Bucky say that: that he found him to be sweet.
Zemo could remember everything that had happened at the Sokovian memorial, in vivid detail. He remembered Bucky behaving as though he was going to kill him, only subvert Zemo's expectations. Bullets rained to the ground and not a single one of them was intended for the baron. Bucky had proven Zemo's suspicions to be correct: that he was a good man. That not everyone injected with the serum would become like Johann Schmidt or Karli. There was another Steve Rogers, and he was standing right in front of him.
Zemo remembered wanting to kiss Bucky in that moment. And if the Dora Milaje hadn't shown up, he absolutely would have.
That was part of the reason why this whole affair had been so difficult. Up until now, every kiss, every embrace, every touch -- Zemo had been holding back. There was always something or someone telling him no; some voice in the back of his head reminding him that Bucky wasn't his to take. And he still wasn't, technically. But god, there wasn't anything standing between them anymore either, was there?
So. How much sugar? However much Bucky was willing to give him. Zemo stood up and threw his arms around Bucky's shoulders, drawing him in a pressing a kiss to his lips. Something warm and passionate and greedy. The sort of kiss he'd wanted to give him in Sokovia, the sort of kiss he'd been dying to give Bucky since his arrival at the Crown Plaza. He wouldn't let up, either. Not until Bucky eased away. Which wasn't very sweet of him, but he figured Bucky would forgive his blatant enthusiasm..