Juujin Kishi no Kyuuai Jijou

Emma, ​​a human, has a close friend in the beastman aristocracy, the Serpent Duke. She works as a potion maker, but the Serpent Duke has an unexpected request. It's a request for a strategy to help Lyle, a sacred unicorn beastman and royal guard knight, overcome his fear of women...!? They begin their training, but they start by holding hands and even interact like lovers! ...Don't you think their physical contact is a little too intense? A courtship love fantasy begins with a lesson with the unicorn beastman knight!

(Source: Ichijinsha, translated)