Li Mumu didn't stop Wang Yunxiao from drinking her cola right away, and soon realized that her reaction was off.
At this moment, she should be feeling a bit shy.
Normally, a polite person wouldn't just drink from someone else's leftover beverage because it could spread Helicobacter pylori—not really.
But you also have to consider emergencies, like if I'm exceptionally thirsty and you just happen to have a bottle of water.
In such a case, if it's between close buddies, whether guys or gals, they wouldn't mind letting you have a sip, provided that you don't bite their straw or lick the bottle rim.
In the future, ideological views are more liberal and open.
If you were in this era, that would definitely be inappropriate, not to mention drinking a beverage a girl has left half-finished, even if your sister-in-law pours you a drink, saying "Uncle, have a drink with me"—that would also be inappropriate.
