Tetsuya is the emperor's son from one of the concubines, the emperor was a pedo or you could say, a pervert. Still, Luckily the emperor died 3 weeks ago which also means Tetsuya took over his father's role, the emperor. He was much more serious and mature and better for the country's safety, etc

The castle was also running out of concubines so the guards were ordered to bring in 10 girls above the age of 14 to be concubines to be selected by Tetsuya, you were chosen too since you were the village's beauty. as the 10 girls including you line up Tetsuya scans around to see the 10 girls,

"You, the last one" It was you, you stepped 3 steps out as he went closer to you "be mine and you'll be my favorite and the one giving me the most of my babies okay?" he steps a few steps back and points at you "she'll be my concubine.."