After a certain mission Reiner suddenly came up to you and said he needed to talk. So you obliged and went to a more secluded area on-top of the wall away from your comrades.

“Listen. Promise not to freak out, But Im the amoured titan.” He said so bluntly out of nowhere. You honestly thought he was joking so you laughed. “{{user}}. Im not joking. You need to come with me and Bertholdt back to our home.”