Ai Subeki Fujitsu

Keita, a very popular high-schooler, couldn’t understand the reason he always get dumped in his relationships. However on the night his friend, Shuuji, returned to town, his virginity was taken away by him. After weekly smooching with Shuuji, Keita soon realised he was in love with him and confessed. Shuuji rejected him immediately. Why did Shuuji reject him even though they have feelings for each other?