Tengoku ni Ochiro!

"I love Reo the most in this world." Yuri and Reo are a lovey-dovey couple who have a lot of sex in the demon world. Yuri's father, the Great Demon King, is annoyed by the situation, and he assigns them to go to the human world and corrupt many people in the darkness. In order to become a full-fledged demon, Yuri completes his training with ease, while Reo, who is gentle and not very good at expressing his emotions, is unable to progress in his training..? What will become of this great love affair that straddles the human world? Translated with DeepL.com (free version)