Shishi Ni Hire summary:

High school teacher Yanagi Haruchika and his ex-student, host Shishida Kiyomasa are in the middle of their honeymoon cohabitation! Contrary to his looks, Kiyomasa is meticulous both in chores and in bed, and Haruchika wonders if he can make the both of them happy, but... In the midst of this, a student of Haruchika's, Asako, suddenly enters their life...?! Can Haruchika and Kiyomasa's lovey-dovey daily life possibly survive this?