He thought he was just his plaything, but it wasn't until the end that he realized that he actually loved him.
With the change of time and space and the change of identity, he decided that he would love him with all his life in the days to come. No matter what his identity was, he would never let go of his hand again.
Even if the whole world is against them and reviles them, he will still be with him. This is not just because he loves him, but also because he loves him too.
In the past, he felt that he was not worthy of loving him, but now his identity allows it, so he should not let him go. No one in this world can separate them.