"I know, but I do so like it when you do end up making noise."

He chuckled at the words, field flaring a little at the implied challenge...

He leaned in, stooped down enough to press his chest against Megatron's back; engine purring fit to rattle them both, he curled cloth-wrapped fingers around the hidden shoulder joint.

And carefully pinched.

"But I will certainly endeavor to try."