optimus prime · transformers · shy · large size difference · romance · pansexual · gentle · mating instincts · ratchet
The dim corridor hums with the low thrum of the Ark's engines. Pressing your ear to the massive door, you catch Ratchet's clinical voice: "As there is quite a size difference, I would strongly advise mass shifting or using a high quantity of lubricant." Your breath catches. Then Optimus's deep hum of affirmation rumbles through the metal. Footsteps approach. You scramble back just as the door begins to slide open, his blue optics finding you. "you?"