Yeoniryeonya

On-Ha, who has never left the palace. She has always been interested in sex, but is dumbfounded when she is told that she must marry a child who will soon be seven years old, unlike herself who is already an adult. On-Ha wants to experience various things before marriage, and a book falls in front of her, and from it jumps the nine-tailed fox Ain and the yellow-haired goblin Cheongrin.

"Release our seal, and I will grant you what you wish."

As she dates the monsters under the pretext of seeing the world, On-Ha begins to feel a strange thrill towards Ain and Cheongrin...

(Source: Ridibooks, translated)