Orion's reactions, planned or not, to his own as he responded to Orion fed back into him and threatened overload. Particularly as he could feel Orion try to loom possessively and the kiss sent a shower of spark-like charge down his circuits.

"As you---ah - say, Orion," laughter weaved together with static as he met the thrusts open and with only just enough resistance to make Orion have to push a shade harder against his clutching valve, and being held inside for half a moment longer before he could withdraw.

Shuddering just as much from the vibration of Orion against his throat as the tone, the charge thundered hot and lightning-huge through him, every single thrust driving the overload closer---

"Orion," Megatron growled, helm thrown back, back arched and he was holding back only for the mech above him.