Kneel Before Me, Hero!!

Crown Prince Urban Dennish of Rosefillia is blessed with both good looks and wit, and the knowledge that he has been reincarnated inside a computer game. He invites himself to visit Kyle, the prospective hero, to help him level up before the Demon Lord is resurrected one year from now. Seeing how busy Kyle is and realizing he doesn't have the time to raise his level, Urban offers to help out with the housework, and one thing soon leads to another...

(Source: Renta!)