After his parents death when he was 6, Touma was adopted by his distant relatives and Tetsuo became his older brother. When Touma sees Tetsuo crying on the beach after breakuping with his married lover, he realizes his feelings for Tetsuo, but afraid of ruining his family, Touma hides his feelings. After Touma is unable to go on his class trip due to his severe separation anxiety, Tetsuo's feelings change as well. But, the two continue to fight their feelings, so the can remain together.
Uchi no Ani no Renai Jijou