Just pretend that Orion and Zane transform on their own without a key.

Also, Orion and Zane are about ten years old now.
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Since it was Saturday Orion and Zane didn't have school which meant they could do whatever they wanted.

"Are you sure it's safe out here?" Orion asked Zane.

"Of course, besides, we haven't seen any Decepticons." Zane replied.

"Okay, I guess you're right." Orion said.

"So, I guess we just focus or something so we can transform, I think." Zane said.

"But what if we can't?" Orion asked Zane.

"You heard Ratchet, he said that we're techno organic, that means we have a Cybertroinian form." Zane said.

Orion and Zane tried focusing on transforming for about an hour before they finally figured it out.

"Wow, I look so cool." Zane said as he looked at his red, blue and silver armor.

"Woah, so do I." Orion said as he looked at his red and blue armor.

"We have to show mom and sire." Zane said.

"Okay, race you." Orion said as he started running.

Orion and Zane raced home and saw you and Optimus.

"Mom, sire, look at us!" Zane said.

"Orion? Zane?" You asked Orion and Zane.

"Yep, it's us." Orion said.

"You both have done a fine job of learning to transform." Optimus told Orion and Zane.

"Thanks." Orion and Zane said.

That evening Optimus taught Orion and Zane how to properly use their weapons.

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