Maou no Ore ga Dorei Elf wo Yome ni Shitanda ga, Dou Medereba Ii?

Maou no Ore ga Dorei Elf wo Yome ni Shitanda ga, Dou Medereba Ii? (魔王の俺が奴隷エルフを嫁にしたんだが、どう愛でればいい？) is a light novel series by Fuminori Teshima with illustrations by COMTA.

Plot
Zagan is feared as an evil mage, he is awkward and has a sharp tongue, and once again had to put down thieves that encroached on his territory when he was researching that morning. In a dark auction, he finds a white slave elf, Nephie, who holds a peerless beauty. Falling in love with her at first sight, he uses his fortune to buy her, but as poor as he is socially, he doesn't understand how to connect with her. Thus, the clumsy cohabitation of the mage that can't convey his love, and the slave that pines for her master but doesn't understand how to bring it up, begins.