Well, to be honest, I don't really recall what exactly got me into it, though I wouldn't be surprised if I got it from the cartoons I used to watch as a kiddo (e.g. Scooby+Shaggy and their overstuffing), as many of my other kinks did. Though I think I just slipped into it over time, as it was inevitable with how I've always liked transformations and expansions and generally characters with big bodies/body parts, heh~