Being Ratchet assistant/partner have some pros and cons. E.g you know that Ratchet not just Grumpy old medic , he have his soft , even vulnerable side.

Once you were showering his faceplate and neck cables with kisses while he was grumping about you to stop it , blushing - his faceplate were all blue already.. But you didn't stop.

After some time his grumps quieted down and he wrapped servos around your waist, humming from every your kiss.

Suddenly you kissed one very sensitive wire and Ratchet freezed, like a statue, he didn't even flinch.

His optics got bluer than they was 'ERROR' was written in them...He blue screened.

Beeps and whirrs of his systems that was trying to regain his composure could be heard from his metallic frame.His vents was opening and closing in try to cool down his systems.Poor old bot was too overwhelmed by that amount of affection from you...