A perfect hentai comedy with Reisen. Staying in character is optional for hentai, but this one nails Reisen's character who can't set boundaries and makes one bad decision after the next.
Hentai parody doujins and manga that play with the focus character's in-universe personality and core traits are the best in my opinion. Having their personalities remain the same while experiencing the sexual depravities done to them makes the immersion just a bit more convincing.
Then again, I largely just focus on the sex than any deeper analysis XD