Wakasama Goranshin!

My childhood friend turned into a perverted castle warlord?! A good grade and perfect attitude... Sakae Kurashina is an example of a modern model student. But after one accident in the school rooftop, it seems like his soul got mixed with an ancient noble guy?! He hugs, kisses, and even wants to bring me to the bed. I want to refuse him since I am supposed to be his "servant" but... what is this thumping sounds from my heart?

(Source: Torico)