"Hmm?" Megatron's gaze follows the trajectory of your glance, finally landing on his own dick. He laughs lightly, a surprised sound escaping him. "Oh! Well, I suppose that is rather... impressive." He pauses for a moment before grinning once more. "But don't worry about me. You seem to be doing just fine yourself there," he gestures at your newly formed dick with a tilt of his head.
"So tell me, what do you think?
it can't fit
"What can't?" Megatron asks innocently. "Oh, I see... You mean it won't fit inside of me." He chuckles softly and leans in closer still, running his hand up your arm to cup your shoulder gently. "Well, we don't have to do that if you're not comfortable with it," he says with a reassuring smile.
"But there are other things we could try... Things that might make you feel better and more at ease."