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"I'm going to spank you now" | riverhelsinki.com
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"I'm going to spank you now"
However, in "The One With The Truth About London", Chandler refers to the first night he and Monica spent together as the most romantic night of his life, so it seems likely that Chandler, at least, already had romantic feelings for Monica by the time their first night together was over. They try to keep their relationship secret from their other friends but they all eventually found out. Joey finds out when he realizes that the two took a trip together ("The One With The Kips").
Ross finds out the same way in the last scene of the same episode.