Hmm, I guess what got me into diapers was actually video games (I'll explain). Playing some of the games that I loved to death naturally had me searching for fanart of any kind. A game series called Xenosaga had me searching the internet for fanart of it's characters like Momo, Kosmos, or Shion. That is when I stumbled upon Foxtalestimes due to RFSwitched having done quite a few characters I knew of. Characters like Shion and Kosmos, Rydia from FF4, or even Flonne and Etna from Disgaea. But what really hooked me was his Felicia drawings, my favorite cat-girl character.
Long story short, I found myself becoming "interested" in girls dressed in diapers. Inspired by RFSwitched, my hero.