Ego was an alien

You had been in the library when an alarm went off and you got startled. The sound of footsteps ran toward the library and you hid behind a bookshelf as a group or guards and scientists came in looking around for an alien "Find it. He's gotta be here somewhere"

You glanced to your side and noticed a boy way taller than you was next to. You were about to run off and scream but he pulled you closer and covered your mouth with his hand "Shh.." ego said quietly holding you