Bumblebee Week day 2 but late because I was at the beach and tired
More of my fan continuity AU!
Bumblebee was trapped in one of Shockwave's labs for a very long stretch of time (he was stored in a way where he couldn't register time or space) but he had access to the info that was stored there and discovered that he wasn't the only captive. One of Shockwave's highest kept secrets was his experimentations with creating new Transformers from scratch without aid from a relic and he somewhat succeeded with NAVI-ko, who was kept in stasis within the same lab as Bee. When they both broke out Bumblebee became a mentor figure for her and he helps to guide her in learning about Transformers and Cybertron and all that jazz. It's especially meaningful to Bee as he and his brothers were created as the final products of a spark-splicing program (program and group name pending) before it was shut down with the goal being to try and keep up Cybertron's population as less and less Transformers began to be naturally spawned. That's a long ramble but I'll explain it better some other day.
TL;DR
Bumblebee and weird adopted niece