Orion.

The Cybertronian stopped in his tracks when your voice called that designation out loud, one he was extremely familiar with.

He could feel his own breathing shudder, vocalizer unable to let out any kind of sound with his dermas slightly quivered. You weren't supposed to know that, he swore to never let humans know his past to keep them safe...

"... Where... how did you know that?" The Prime's vocalizer was faintly shaken, blue optics visibly showing the vulnerability starting to crack.