That river in Egypt

Damocles' face lit up as Rennala handed him the bottle of juice. He was finally going to get some! She grabbed a new cup from behind her and held it in-front of him. Trying to stay steady, he poured the juice up to the top. He set the bottle down and went to grab the cup when she moved it away from his reach and leaned forward, looking down at him.
"Not so fast hehe"
"Come on, please can I have it?"
"Hehe, I don't feel like letting you have any"
"Whyyyy"
"Just because. But, I will let you have it if I can spit it into your mouth hehe"
She smiled sweetly despite what she was offering. He was really caught off guard.
"Uhhhhhhhhhhhh"
"Hehe you heard me right. Either I spit it into your mouth, or you don't get any. Would you still like some?"