Manga by author Otousan - Status ongoing

A manga about a tomboyish girl dating her elf boyfriend. The stories before and during dating are separate.

About the story of an office lady and her boss

In a world where people have supernatural creatures as pets, a certain family has a pet demon-lord Satan. The main carer of Satan is the son, Yuuhei. From initially coaxing the new Satan out of his pet-carrier, to walking him, playing with his ball, and keeping him from fighting with the neighbor's pet Hero, this is the comedic story of a boy and his Satan.

In order benefit their families, Koyuki (Age 16) was wed to Shin (Age 37). Despite the large age gap, both are exceedingly inexperienced in the matters of love, so they never quite know how to act around each other. To make matters worse, Shin is forbidden from being physically involved with Koyuki until she turns 20. In this environment, how will they form a proper husband-wife relationship?