Figured I'd throw this up here as well, the Living Unit tag on pixiv, and the DG(Dark/Devil Gundam) cells tag is in the recomended area.
http://www.pixiv.net/tags.php?tag=%E...83%83%E3%83%88
Also, I remember this being posted before, but no matter what keywords I used I couldn't find it(and didn't feel like looking through 200+ pages to find it). Fate/Stay Night's Rin Toshaka becoming a catgirl, spawning multiple copies, copies becoming evil demon catgirls, and lots of sex(though I haven'y had a chance to go through it in detail yet). 1 is basically about her as a catgirl with the coping at the end, 2 is about the copes with a shadow of the corruption, 3 is about evil catgirls, 4 is also about evil catgirls. There's a little blood though just to be warned.
http://g.e-hentai.org/g/81519/a63448d4d7/
http://g.e-hentai.org/g/27300/59de808730/
http://g.e-hentai.org/g/71625/11b816e853/
http://g.e-hentai.org/g/99056/24d4790540/
Also, some bonus Dark Sakura.