Anime Recommendation w/ Female Corruption/Transformation

[cppietime]

Put simply, I'm hoping someone can recommend me an anime in which the following happens at least once, preferably more:
Cute/Innocent female anime character introduced, gets some development, audience gets to know her, etc..
Something comes along causing her mind to become corrupted and her body to transform with it, into some sort of succubus/demoness-esque thing. Kind of like what's seen at: http://thextra89.deviantart.com/art/Request-Girl-to-Devil-tf-1-268047022
non-hentai only, btw

[Anime Forum]

Put simply, I'm hoping someone can recommend me an anime in which the following happens at least once, preferably more:
Cute/Innocent female anime character introduced, gets some development, audience gets to know her, etc..
Something comes along causing her mind to become corrupted and her body to transform with it, into some sort of succubus/demoness-esque thing. Kind of like what's seen at: http://thextra89.deviantart.com/art/Request-Girl-to-Devil-tf-1-268047022
non-hentai only, btw

The first thing that came to mind was a hentai to be honest o_O. Uhh, any other details?

[Umisho]

I don't know it's related or not but..
try to watch "Hyperdimension Neptunia ; The Animation" ..