[Prince of Tennis] Heartwarming

If Yukimura Seiichi is the Child of God, and Sanada Genichiro is the Emperor, then the Child of God must be the treasure Heaven bestowed upon the Emperor. The first Prince of Tennis fanfic: Yukimura x Sanada, Sanada is the receiver. The protagonist transmigrates into Yukimura. No wish fulfillment, sweet and cozy. This is my first attempt, so please feel free to point out clumsy writing or unnatural descriptions (*^-^*)