Zemo nodded, carefully taking the bottle from Loki and pouring himself a shot, if even that much. The baron was curious to know what Asgardian liquor tasted like, but he wasn't itching to get completely wasted just yet. They were here to get tipsy on the beach, yes, but Zemo had offered to spend time with Loki because he knew she had recently suffered loss. Zemo was trying to help his new friend feel better, not have her babysit a (in comparison to her) lightweight human.
She hadn't asked, but Zemo would pour some for Loki as well. He could only guess how weak everything in the bucket was for Loki compared to what was in the dark bottle. And if Zemo was starting off strong, perhaps Loki would like to do the same. He offered it to her with a smile. "Thank you for sharing this. I do appreciate it." He hesitated before adding, "Is Stephen your.. boyfriend?"
Zemo hadn't quite picked up on the fact that Loki was referring to the sorcerer supreme just yet. However, he did presume that anyone who was willing to come out and help Loki back to the hotel might have been more than just a friend. Which.. might have said a lot about Zemo's relationship with Bucky.