As the Demon King, I have married a slave elf. How should I express my love?

Summary My wife is a slave elf! A clumsy, wicked (?) young man is about to face an unprecedented and major challenge!How can we resolve this situation...?Sagan was regarded as an evil magician by everyone, and people avoided him like the plague. He was introverted, taciturn, and his words were often harsh. Today, he was both studying magic and sweeping away thieves in his territory. At an underground auction, he discovered a slave elf of unparalleled beauty; this fair-skinned girl was named Neferpitou. Sagan fell in love with Neferpitou at first sight and spent all his wealth to buy her. However, being poor with words, Sagan didn't know how to interact with her.A magician who doesn't know how to express his love, and a slave who admires his master but can't express it—the two clumsy individuals begin their cohabitation.