New AP find that needs help with identification!

[chriskim019]

Ok, I just somehow stumbled upon this Youtube video and discovered an AP sequence that I've never seen before. (Sometimes, watching random clips that feature various collection of anime transformations on Youtube enables unexpected discoveries.) The sequence is from 2:59-3:05 in this clip.

Even though the transformation is censored, I think it is clearly an age progression as her butt silhouette expands, and her after appearance looks older. Neither the uploader nor any of the comments classify what anime it is from, so I was wondering if anyone here knows anything about it.