I can imagine that most of the people on this site that are in a relationship involving diapers were probably the ones who initiated the relationship. Truth be told, that wasn't the way it happened with me. Sophie, my girlfriend (now my wife), began our diaper relationship.
Ten years ago, in the summer of 2002, I was visiting my girlfriend at her house. We just finished our freshman year of high school two weeks earlier, and we were planning on spending a lot of the summer together, as most of our friends were spending their vacation out of town.
On this particular day, her parents were out spending the day with my mother. We had her house to ourselves for the day. After watching some TV and swapping some jokes, Sophie asked me very seriously if I could keep a secret. I told her "Of course. What is it?"
She led me up to her bedroom and we sat down on her bed.
Then she told me about how she had gotten surgery a year earlier. Her mother needed a kidney transplant, and Sophie was the donor. I don't remember much else about it, but she told me that for some reason, the surgery had rendered her temporarily incapable of controlling her bowels. She explained that because of this, she wore adult diapers for incontinence for a while.
I was quite surprised (yet interested) to hear about this. I told my girlfriend that I could easily keep a secret like that, but then she told me that there was more to the secret.
She went to her closet and pulled out a package of adult disposable diapers. She set the package down on the bed and told me the REAL secret: she eventually regained control of her bladder, but she found that she actually enjoyed wearing the diapers. She told her parents about this, and they saw nothing wrong with this. Her mother still felt she owed her daughter for willingly giving her her kidney, and she wanted her daughter to be happy, so she agreed to this.
When Sophie was finished telling me this, she said "I hope you won't judge me for this, Arnold. I just thought that as my boyfriend, you have the right to know. I'd hate to keep such a secret from you."
There was a long interval of silence between us. She seemed very anxious about how I would react. I, on the other hand, was close to bursting into complete rapture. I just embraced her and kissed her on the lips. Then I softly whispered "You're not alone."
I could see she was confused, so I decided to tell her one of my own secrets. I told her about how my mother had kept me in diapers when I was five through eight years of age. Then I told her that even once I stopped wearing diapers that I still had a fetish for them. From when I was eight through fifteen, I only wore them once, but other than that, I had never worn them again. I told her that I still longed for that feeling.
Soon, she and I got the same idea. Sophie said "We've got the house to ourselves until seven o'clock. It's two o'clock now. How about we... slip into something more comfortable?"
I smirked and agreed to this suggestion. The two of us decided to diaper each other, despite the fact that we had never seen the other naked before.
She had me lie down on the bed. She pulled off my shirt, along with my shoes and socks. Then she unbuttoned my jeans and slid them off my legs. Before she pulled off my boxer shorts, she went ahead and got a diaper ready. After she unfolded it and laid it out on the bed, she slowly pulled off my boxer shorts. Both us then realized that I was having an erection. She just smiled and stroked my penis a few times. I almost climaxed, but she quickly relented and slid the diaper under me. She pulled the front of it up between my legs and fastened the tapes on either side.
I just laid there for a moment, grinning. I came back to reality when she asked me how it felt. I responded by saying "Incredible."
I then stood up and said "Your turn!"
She smiled and allowed me to undress her. I unbuttoned her blouse and slid it down her arms. Then I undid her skirt and helped her out of it. Soon she was standing before me in just her bra and panties. I unfastened the clasp on the back of her bra and she removed it justly. That was the first time I ever saw her breasts. Sophie was 18 at the time (like me), but her cleavage was developing nicely.
She laid down on the bed as I prepared another diaper. My mother had taught me how to diaper myself when I was six, so I figured it shouldn't be that much harder to diaper another person, especially when this "person" was my girlfriend of ten months.
I ever so slowly slid off her panties. I tried not to stare at her crotch, as I found it vulgar to do so at the time. She just giggled and said "I'm ready."
I took the diaper and slid it underneath her bottom. Once Sophie was in the proper position, I pulled the front up between her legs and fastened the tapes on both sides.
There was a short silence. Our eyes met, and there was a strange connection between the two of us. I laid down on the bed next to Sophie, and we started making out. We cuddled, so to speak. Both of us felt so relaxed and at ease that for a long while, there was just the two of us. To us, nothing else existed for a half-hour.
Once this half-hour was up, the two of us fell asleep in each others' arms.
We woke up at around five-thirty, well before her parents and my mother would be returning, so we just hung out some more in our diapers.
Fifteen minutes before they got home, we got dressed again. But we pretty much had our summer vacation fundamentally planned out already!
Ten years have gone by since then. Sophie had helped me revive my diaper fetish, and I was forever grateful for that. She and I stayed girlfriend and boyfriend until we were near the end of our senior year of college. Then I asked her to marry me. That was in 2008. We've been married four years.
The two of us have a young son named Geoffrey, born September 6th, 2010.
To this day, the two of us continue to diaper each other (and our son, of course. But we plan on potty-training him soon).