The leader of the Raijin Kai 「雷神会」 circle, Haruki Genia 「はるきゲにあ」 is one of the best artists to parody Love Hina EVER. That may be jumping the gun, but it is true. Raijin Kai is not a 100% futanarist doujinshi circle, Hard SM is their specialty. Each doujinshi depicts a form of sexual humiliation and bondage; and each doujinshi of the circle features at least one scene of distended stomachs: be it due to pregnancy, internal semen collection, or heavy enema - defining the circle's Hard SM 「ハードSM」 terminology. Haruki Genia gives a quick translator assisted profile on his homepage which is displayed below:
Hi!
My name is HARUKIGENIA.
A cartoonist is done in Japan.
The story of the contents that it comes of age very much and to turn is being drawn.
It likes to draw the picture that a cute girl is bullied.
It likes to draw the picture of the girl of the big breast.
It likes to draw a little girl's naked picture.
It likes to draw a restrained girl.
Ask it.
The two major series are below in the two headers: Mazo Shino and Jintoku No Kenkyuu.
Jintoku No Kenkyuu 「人徳の研究」
A bizarre doujinshi featuring original characters and their sexual humiliations (in public).
There is no true main character in this series, but there are some recurring characters.
Mazo Shino 「マゾしの」
A hard SM doujinshi that parodies Love Hina characters.
The base story arc in Mazo Shino is the taboo relationship between Naru and Shinobu, eventually degrading into a true passion between the two.