Overlord smirked against the other's panel, mouthing at it a bit now, registering the heat the other was radiating. It made the purr of his engine louder, the grip of his hands on Max's inner thighs tightening--practically massaging them now.

"Open up, pet," he purred before tracing the seam of the panel with his tongue all the way around.

This was his favorite part of his encounters with the other mech because he knew what it did to his captive. Knew what was going on in his head because he'd experienced things similar before. He'd never been this much at another's mercy before but..well...some bots just didn't have his strength now did they?