Tonari no Jijou

Tonari no Jijou summary:

From Shinmakoku Scanlations : That day, Miyata, who is still preparing for his university exam, got home and found not his brother, but an unknown man. That man, Shirai, has just moved into the neighbourhood. He looks at Miyata's messy test sheets and offers, "Shall I teach you?" With his airy smile and nearly perfect self, Shirai forcefully becomes Miyata's private tutor... and Miyata slowly becomes interested in Shirai...