Awww, I really loved that! Even though it didn't explain some things, which was a little annoying, and I really, really wish there were more. It's the sort of thing I want a million volumes of, just them on missions and traveling, more focus on the second couple, etc.
There are still multiple things that make no sense, but whatever. The main story does, so hey. Very sweet couple, and they're so pretty! I wanna read more stories like this. D:
EDIT: Oh! There are two oneshots in the same universe. I hope to see more in the future. Now to read those extras.
Musebinake, Junjou