"I don't see why." Absolutely shameless, in both statement, smirk and intent, though it softened with static when Orion licked the sparklight. It wasn't sensitive as such, but the metaphorical connection between those lights and the spark hidden and protected within was strong enough to tease out a reaction.

Because it wasn't hard to imagine Orion doing the same when his spark chamber was bared. Or the spark itself. That thought caused a shudder to snap through him and he arched - right into Orion finally pushing inside.

Megatron groaned, engine roaring in a brief rev as his valve flexed around the spike and then clutched.

Yes.