I feel bad for all the dead birds in this story T_T
so this is about a beta and omega pairing. Omega always shows everyone his love for beta. However, the beta was self-conflicted and kinda had this mentality that he had to help the omega. His twisted love once made some other alpha having sex with the omega and even said to have them pair up.
we then see a story of them way back in childhood. Omega is an orphan. He was adopted by the beta's family as a pair for the beta's brother (an alpha). However, when the omega was assaulted by the brother, the beta came and hit his brother. After that, the family decided to stop adopting uke..
They later met when they grew up. Uke was in a bad shape. He lied about being a beta and tried to find work to live by each day.. Some bad experience happened cuz seme couldn't make up his mind. In the end, seme confronted his feelings and decided to stay with uke.
Altruist