I have always messed my diapers but by myself, I knew I liked doing it, but out of respect for others I kept it private, I lived alone so in the mornings I had all the time in the world.
When I met my girlfriend and we got close I told her my diaper secret, she was cool with and as time went on we got closer and closer. At first I would just be diapered around her, she would go about her daily routine and there was no dynamic that involved us and diapers / little stuff. Overtime she became more and more of a care taker, she actually admitted that she liked seeing (in her words) "my cute butt" and she liked the cuddling.
Towards the end of August (or maybe it was labor day weekend) she was spending the night over, and she got me ready for bed, she put me in my batman union suit pj's, and we just melted with each other, the next morning when we woke up I went about my morning routine, 2 cups of coffee later sitting in the living room with her I felt nature call very suddenly, I got up pretty fast and was headed towards the bathroom, at the same time she asked what I was doing, so I told her number 2 was calling, she said "and..." I was like well I'm going to the toilet, she didn't agree with my decision and said I was diapered and suggested that I use them.
Well I did and was very red in the face, I got cuddled for being good and then told to jump in the shower and get cleaned up, when I got out of the shower she was waiting for me in the bedroom with a new diaper already spread out on the bed and waiting for me.
That was her way of saying it was ok to use them, now I just go if I got to go, she even changes me now and doesn't mind the whole thing, I'm very lucky to have her in my life.