That river in Egypt

"Sure..."
Rennala swirled her cup in slow circles while looking down at him.
"Well, I didn't quite finish my drink. I know you put effort into making it for me, so I'd hate for it to go to waste. How about you finish it off for me?"
She handed him the cup, there was just a little bit left in the bottom. Personally, he was quite the germophobe and didn't actually want to drink from a cup that somebody else drank from, but he didn't want to be rude. And the way she frame the task made it almost seem like it was something that he got to do for her, which somehow made it easier. He went to drink from it before she cut him off.
"Uh uh, turn the cup around, I want you to drink from the side I drank from hehe"
She was pushing it, but he turned the cup around and looked at it closely. He could see a faint outline of where her lips had been, this was difficult for him.
"Go on"
He quickly turned the cup up and drank the contents, getting it over with.
"Hehe good boy"
"Uhhghg"
"Was it yummy?"
"I... sure"
It was strange, she had actually got him to do that. He held on to the cup, unsure what to do anymore.