Ordinary Kenichi meets an ordinary woman named Hime, they date and get married. But it turns out his wife has a big secret and when tries to surprise her on their first year anniversary with a new puppy, things take a turn for the bizarre! Why is Hime suddenly a guy!?
(Source: Terrible Trio Scanlations)

From Gaku Gaku Animal Land:

Kourin’s sudden disappearance not only leaves Marisa worried but leads her to contemplate her memories of him.

From Eternal Dream:
Older brother, Ikusa, is great at fighting, but is better at housework. Younger brother, Mikado, harbors feelings for his older brother. But Mikado can't get his feelings through with a direct attack, so he uses Ikusa's weakness, alcohol, to get his way...!!! Even cousins Riki and Miyako and little sister, Konomi-chan, get sucked into the craziness of this erotic comic series.