GUN-704 - What happens when a giant member suddenly pops out of a hole in the wall?

I'm a fan of the glory hole genre, but I didn't expect much since it's an older release. However, Maya Asagi was great and Yui Mizukami was cute, so I'm giving it a rating. That said, I wouldn't go out of my way to recommend it to others, hence the score. I do like that they show the actress's name before each chapter.