DDB-210 - Kimeseku Best Vol.4

A common theme in this series is that their personality changes before and after the transformation. There's no internal ejaculation, but watching them lose their inhibitions gives a strange sense of satisfaction. The premise itself is wild, but it definitely stands out from other transformation-themed works. Also, from the 3rd video (Sawamura-san), it switches to a 16:9 aspect ratio, which makes it much more enjoyable.