Just a quick speculation on this: Sophia and Dylan are arriving home. Sophia happy, overexcited, sweaty and a little drunk, instead of taking a shower, she decides to use the pool without changing her clothes. Of course she doesn't want to ruin the dress. Dylan just manages to turn off the pool lights...If dirty dancing was the animation plan, how does that equal being on par or slightly jumping ahead of Sam, per his comment? If the jacuzzi is the after part of the club, that would be three re-hashes with Liam, Sam, and now Dylan.
Edit - And why return to the water, when they were in the water in part one???
Because somehow they have to wash themselves.