I think they might have meant like actually sleep together not have sex hisoka-chan
It's very obvious that yeong meant that he wanted to have sex because that's all they've been doing and nohae understood that. he didn't want to because he might've been shy. It's "spicy" or whatever but the main point is that nohae isn't dense and didn't consent it.
THATS WHY YOU SHOULDNT REJECT THE PERSON WHO WANTS TO SLEEP WITH YOU >:)