Me and the wife are both Littles. I'm way better at switching than her, at least I think so, so usually I baby her a couple of times, or encourage us to get into little space and then she uses my new moves back on me when she decides to give me a turn. That works out though as my caregiver moves are based on my own fantasies. She's a good and open lover, just embarrassed by her little side despite years of marriage and us sharing the same kink.
Obviously, she's diapered me and changed me, and I have for her. Sometimes we'll be playing a game or something and I'll get too into it and wait too long and pee my pants, and she'll clean me up but put me into diapers until I'm ready to be a big boy, She's used a wand on me and that's pretty cool.
What I'd like is for her to go "Ara ara" on me, push me in a bed, untape my wet diaper or take off my wet pants, stroke my cock a bit, tease me a little, then straddle and fuck me while I'm in full-on little mode. However, I can tell it would be too heavy for her for me to do that to her when she's in little mode, so I haven't figured out how to convey what I want without ruining it or making it awkwar for her, which I won't do.
We get it on when we're both in little mode, or when neither is, but we've never fucked as caregiver/little, though she's used the wand like that on occasion. I'm sure we'll work up to it eventually.
My complaints must seem like bullshit to most others though, we've got an awesome relationship to be sure and I'm fully satisfied, just can't help considering perfection.
She doesn't do messing, and I only get a weird compulsion to mess like once every 4 months when the house is empty and usually end up with massive post-fap regret. I'm not sure I'd want to go there anyway as it looks hot in porn but the smell of someone else's poop in person might be too much.