The Enigma I Raised Wants to Marry Me

Xing Sui is one of only two E-rank Enigmas in the entire interstellar world, the only son of the Emperor of the Imperial Federation, and the crown prince. Ian is an exceptionally rare SSS-rank Omega across the stars, the former dean of the Imperial Noble Academy and the author of the Seventeenth Omega Rights Bill. He began tutoring Xing Sui as soon as the boy was born. When Xing Sui was five, he said, "When I grow up, I'm going to marry you." Ian dismissed it as a child's innocent chatter and never took it seriously. In his heart, the child he'd personally nurtured and educated was still the little prince who used to lean over a low table to practice calligraphy.

But after Xing Sui came of age, the way he looked at Ian changed.

"Big brother, when are you going to marry me?"