I am 100% down to continue whatever develops between Syaoran and Sailor Moon/Usagi, especially in regards to Moon magic stuff! His upbringing has made him suspicious of any magic users outside of the Li clan/Clow bubble, especially powerful ones, so he's going to be stuck in a weird loop of not wanting to fully trust her but his senses being like MOON MAGIC NICE, THO (also Usagi is totally free to tease him about his relationship with Sakura/gush over it/give him unsolicited advice/etc)

I do also really want him to meet Ritsuka too!! Maybe they can run into one another in the library between all the... robo-bears stuff?? I'm not sure if school is still in session in Deerington or not, but if it is, they can also recognize one another as Sleepers in the halls or in class or something!