Millie of course had to go back to work, but this time she and Scaredy promised to keep in contact more often. Folks in their world lived a lot longer than they do in most other worlds, even the animals, so once Millie retired she and Scaredy were able to get back together, and eventually get married. The good thing was, collecting teeth was the main and most important part of the organization. Accounting was the big time, but wasn't needed as much. This meant that Tooth Fairy Accountants were allowed to retire earlier so Millie did. Millie now lived in Gloom Manor with the others, except this time she and Scaredy shared Scaredy's bed. Her skill with numbers helped a lot around the household, which was great with her. She didn't care what job she had as long as it involved numbers, and now she got one inside the very house where she and her love lives.
Meanwhile, in between all that Ruby and Tal had a son. He looked like Tal, except he had his mother's hair (which was unusual for a skeleton, but not a half-skeleton). They named him Quartz, and he eventually developed a talent for inventing, just like his ancestors before him.
A.N. As for the others, well, let's leave that to the readers' imaginations. After all I'm open minded about other pairings, so I'll let fans imagine for themselves who the others ended up with. All that's really needed to be said is that they continued living happily in Gloom Manor for the rest of their lives.