Probably Cardcaptor Sakura. Or at least the dub, as was the only version available to me at the time. I had a
huge crush on Sakura and had a minor interest in hentai from then on, but then just stopped when the internet box we had hooked up to the TV via dialup stopped working and I went to normal porn when we got a computer with internet.
Fast forward to 2011, I got bored of porn entirely. Decided to dip my toes into hentai properly because I liked the idea of having freedom with fantasies. The first result on Google was HentaiDreaming, and Dreaming had links to manga on its sister site HentaiReader. HentaiDreaming and Reader both got DMCA'd and the chat suggested Fakku, so here I am.
I continue to view it because of the fantasies. I also like that an author can establish characters and flesh out their personalities to some degree in a single chapter. And of course, the porn people make of characters from various series. There's a fuckload of trash, but there is some really nice content that you wouldn't get just from watching the official content.