What's It Like to Marry the Empire's Greatest Mage?

"Donna, the Empire's number one mage? I saw you naked, so now I have to marry you?"

"A cat-eared little girl? I'm your destined one, and I have to help your people multiply?"

"A dashing lady knight? I saved your younger sister, so you want to repay me, and it has to be tonight?"

"…"

I just transmigrated to another world and got a System that can heal anyone. I'm not some playboy.

P.S. This isn't a harem story. It's a harem story.