The charge did hit him, drawing out a pleasured groan. But Optimus was not swayed by it, and it only took a moment of concentration to cycle it back once more, adding on his own charge and sensory feedback in a heavy pulse.

What did take him by surprise was Megatron's apparently voluntary exposure; his own spark and chamber-tendrils flared with want-

But that would overload them both hard enough to put this session to an end. He didn't want to finish it just yet. Not when his revenge was still unsatisfied. So instead, he took the second option: shifting his grip to Megatron's waist, he pressed them together, and angled him so he could press lips and tongue to those exposed ports instead.

The possible charge-burns would be worth it.