The Adorable Deity Spreads Sweetness Every Day

He mistook a little lion for a kitten and brought it home. Well, a lion's a lion. They're all so cute anyway, Gu Heng thought optimistically.

But can someone tell him why this lion loves licking and kissing him so much, and why it keeps going for his mouth...?

One-on-one romance, happy ending. The professional knowledge is fictionalized, and the story has a slow start.