Allegiances

Hiron is born as a loner alongside his sister. He has a perfect life, until an accident happens. He is forced to leave his loner life in the past and join a Clan. However, another accident happens, and he has to leave the Clan. He can only return if he makes a promise. But that promise is risky and may cause heartbreak to some cats.
Will he keep his promise, or will he break it and accept the consequences?