Lotte no Omocha!
Astarotta-10-year-old Princess Sukkuba from the Kingdom in the fantasy kingdom, separated from the human kingdom. As soon as Sukkuba reaches maturity, he should start collecting for her male harem to survive. The only problem is that Astarot absolutely despises men! But her subordinates pushes her to start choosing men to meet the needs of his harem. She chooses as his first candidate in harem ... Human child! Edit: You cannot call him a "child", he has a daughter.