Small Update · 8:18pm Feb 27th, 2023
Hiya, folks! I know it's been quiet for a while on my end, but rest assured, I have gotten a start on the next Affection Therapy chapter. I really appreciate the feedback I got when I asked for advice in the last chapter, and it's given me a good idea of how I want to proceed, so long as I can make it work properly without feeling like I'm rushing or skipping over things. I'm just trying to be careful in choosing what ponies to feature if a chapter encompasses a whole day rather than an hour-long session.
There is one question I never thought to ask until now, and I figured I'd ask to see what the best course was for it. Suppose I devote chapters to having foals like the Cutie Mark Crusaders or Diamond Tiara and Silver Spoon receiving affection therapy. What would be the logical way of making it happen, since our protagonist works in a spa? Diamond and Silver would no doubt be wealthy enough to book sessions themselves, but would it make more sense for the Crusaders to pool their funds, or else be accompanied by somepony who also signed up for a session? Or even have them approach our protagonist when he's off-duty, like on the weekend?
Since this takes place during Season 6, I already have some ideas on what they might need or want affection therapy for, considering a few of the episodes that take place during it, but I just figured I'd ask. 
Personally, I think being accompanied by somepony who also signed up for a session would be the best, but the Crusaders pooling their funds or approach our protagonist when he's off-duty would also work well. Either way, I get the feeling the chapter is going to be load with cuteness.
Another option is to have Applejack give a session as a gift to Scootaloo (maybe for her birthday). After that, Sweetie Belle and Applebloom pester their respective sisters to do enough chores to earn their own trips (a week or two later). Which CMC member is first is at your discretion.
5715811
Aside from the fact that I think you meant Rainbow Dash instead of Applejack in regards to Scoots, I think this is a great idea.
5715846
Oops.
Yep, Rainbiw Dash is what I was thinking but my typing fingers had other ideas!
5715951
Though, that in itself is an interesting offshoot idea—Scootaloo having a connection to Applejack instead of Rainbow.
5715955
Kind of like the Cutie Re-Mark but with the CMC getting shuffled. While that story has likely been written on this site, I've never come across it.
Ponies who should get a session:
1. Diamond Tiara
2. Silver Spoon
3. The CMCs
4. Celestia
5. Cloudchaser and Flitter
6. Flurry Heart
7. Coloratura
8. Spitfire