M-623 - Incestuous Training: The House Where M Resides Part 3

The FACK scene with the ball gag and drool is great. The premise is a bit weird, though...

Riho Matsuoka appears in the third installment. She's quite cute and has a great vibe. This is the best one in the series so far. By the way, the story doesn't continue from the first one; it's an episodic series.

This is an intense production where Reiko Hiiragi is suddenly subjected to anal play, urolagnia, enemas, and whipping. Riho Matsuoka, playing the daughter-in-law, also had some anal scenes which were highlights, but the lack of dialogue before and after the scenes made it a strange production.