Half But Never Whole

Keith has been on his own since he was 8 years old. From foster home to foster home, he was his own company.... until he met Shiro at 14.
Not much changed at the Garrison. Shiro had been the only constant in his life but he didn't mind. He didn't ask for more.

Until Shiro disappeared during a space mission to Kerberos.

Now at 18, he finds himself all alone in space, rejected by his team and his Lion. His Mentor/brother missing or probably dead. With no purpose in life anymore, he lay down on the floor of the old pod accepting whatever fate had in store for him.

How does Prince Lotor fit into this messy team situation?
Can Voltron be formed with a paladin who has always had only half of a whole relationship?

****Trigger warning for self-harm and mentions of non-con****

!!! I don't own Voltron or its characters.!!!