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I am think in the hotel they just made out. And that is the first time they went all the way. Yangyang checks himself for damage and then their conversation about yangyang being hurt. He says he will not do it again. (Going all the way)... yangyang says Don’t do that...
the whisper could be anything... but could be let’s do it again.. we can do it again later. I enjoy it. Etc etc. Something along these lines.

He definitely whispered at him to do it again or that he enjoyed it

Agree!