Great continuation, but I think it's going to be hard for Chris to switch back and forth like that, (sub to man, and back to sub again) as in much confusion for all involved. Not that dogs and husbands are exactly the same, but if you were to walk your pet dog most of the time on a leash, and some of the time not, he'd still get confused.
I really love the "be careful what you wish for..." aspect of this too, but that being said, chastity is only effective for so long, or at least that's the way it worked here. At some point they just seem to come to the conclusion that sex isn't for them any longer, but right up until that point they get to be very useful around the house, so if you have a big project coming up; lock him up and watch him fly.
I find the small penis humor amusing too, guys identify with their careers and their guy parts, and telling your future husband that one of the two doesn't "measure up" has to be crushing. Here it's done with love and humor though, so nothing too evil, so far at least.
Perhaps the bigger house will have a basement that can be modified to hold Chris when he misbehaves, or is otherwise inconvenient to have around. In the truest sense of the word, if she owns Chris' ass, she can do whatever she likes with him, and their large and lifelike purple toy might eventually get replaced with a flesh and blood substitute, and he then demoted to servant class. That's a long way to go for a loving couple, so maybe it just remains a playful threat, "behave or you will be replaced!"
I also like the short chapters here, they're very digestible for me. I generally write longer ones myself, and this style has given me something to think about.
It's a fun story, a great shared adventure for the couple, thank you for sharing it with us, Jackie.