This is a very good story. It's rare to see comparison stories such as this one, but they are by far my favorite, especially when slow-growth is involved. It's even more amazing that Karen is outgrowing her custom-created lifestyle: even the door and shoes which were made specifically for her excessive size are starting to seem small to her. =D
I was wondering, is Japanese your first language? It just seems so to me from your grammar- I would like to say though, your English is very good. It's not perfect, but you do a very good job of describing the characters.
Anyhow, I hope you continue this excellent story, I'll be sure to follow along!
Another great chapter. =) I do hope you eventually return to Karen though. There was barely any mention of her in this chapter, and I had really hoped to see more of her before and after her pregnancy with Kitty. ^__^