Thank you! I was looking for something like this! I'll be making my own list based on this order.
I'm not sure if this is something you want to add to your list, but Payu and Prepai appear as a guest in the Japanese Love in the Air: Koi no Yokai Special Episode. They are there for a race and spend their time at the hotel hanging out with Rei and Kai because they feel bad for them, and because they remind them of Sky and Rain.
They are on screen for quite a long time... And is honestly the best part of the special episode.
If you add it to your list, it would be after the Love in the Air Special, yet maybe before Wedding Plan?
Once again, thank you!