I think I've always liked diapers, but it only became a notable thing to me when I had to potty train, probably around 3 or 4. I remember that I REALLY didn't want to give up my Pull-Ups; I had a weird obsession with wearing and using them well before I was out of them, and I can remember an instance where I pooped in them on purpose and my dad was really annoyed when I asked for a change. Fuck, I'm pretty sure I didn't even go to preschool because I was still in Pull-Ups at 4.
Even once I did potty train, I was a constant bedwetter for basically all of my childhood well into my teens. I think my parents knew something was "off" about me in this regard and tried completely taking me out of diapers, even at night... Nope. Would still wake up, soaked and cold and clammy, dirtying up furniture, so it was back to Pull-Ups, then when those stopped fitting, Goodnites.
My whole family thought I was just a crazy brat until I got into elementary school and the teachers were like "hmmm... yeah, this kid's very... off." I was smarter than everyone else my age on a basic cognitive level by leaps and bounds, but I was always freaking out over stupid things or making trouble by not sitting still. Wound up getting diagnosed with Asperger's (well before it was a "cool" thing to self-diagnose with for victim points.)
Makes some kind of sense regarding diapers I guess, this fetish is completely loaded with autists. I think it's largely the sensory and comfort aspects; diapers are soft and cozy, potty training is a big change where you suddenly have to worry about this constant thing your body's always working on, and not only that, but in doing so you have to sit on this big cold thing that makes a really loud, grating noise when you flush it. Would also explain why it seems like such a fucking sausage fest of a fetish as far as online presence goes; autism, or at least higher-functioning forms like Asperger's, is more diagnosed in males, and women probably don't want to deal with mega-spergs constantly messaging them "WOW YOU LIKE MAKING POOPIES IN YOUR DIAPIES TOO???? CAN I SEE!?!?!? I'M POOPING MINE RIGHT NOW WANNA SEE?????? UUUUOOOOOOOHHHHH ToT"
Maybe I just never wanted to switch to the cold, loud toilet because I hate change. Maybe I had one particular diaper change when I was really little that crossed my wires, where I was either very soothed or molested or something. I dunno. But for better or for worse, this is an integral part of me that I could never get rid of, so I just roll with it. And at this point, I'm more pleased with it than not.
Cumming for the first time while wearing wet Goodnites probably didn't help matters. Even now as a more-or-less grown man, I still have genuine bedwetting accidents if I'm very stressed, tired, or drunk when I go to sleep. And for the people who fantasize about that, I get it, but it's really not fun when it happens in situations where I'm just in regular underwear. Like after drinking at a friend's camp while we're both sleeping in my car... Or making a gigantic puddle on the floor of my buddy's apartment after a night of drinking... Humiliating, uncomfortable, and gross, in a VERY not fun way.
But on the bright side, when I can sleep at home in Goodnites or even an actual diaper when I'm lucky, I NEVER get hangovers. If you drink 1-2 quarts of water right before bed, worst-case scenario, you're really tired for maybe 15 minutes after waking up, and then you're perfectly fine for the rest of the day. I've gone to bed completely hammered, expecting 12 hours of nausea and headache, only to be very pleasantly surprised that I'm perfectly fine 20 minutes after waking up, all because I chugged half a gallon of water right before sleeping. The only tradeoff is waking up soggy, which is just a pleasant bonus for people like us (:
Fuck, I love the XXL Goodnites.