You interrupt before she can make it.

It only takes a few seconds for you to create an idea, and also decide now is the time to voice it.

"Uh... Captain?" you say, your voice not sounding the way you recall due to everything in this situation being new, including the Captain's capture of yourself and your cock. "I would prefer you not throw me in to anything!"

"And I would prefer this blonde 'booty' accept her place as pussy and partner," she replies. "But I just don't see that happening. Do you?!"

"Actually, I see a way we can improve the situation for both of us," you tell her, leaning in and speaking as softly as you can without invading your captor's personal space. "Stow her some place on the ship while you head towards your next destination. When you decide the time is right, throw me in. I can appear as the man I am to her, while still also appearing as though I am following orders from you. When I give her the experience I know I am capable of, she will feel indebted to you, and therefore ready to follow your earlier suggestions."

You then lean away a bit further, and finish, "How about that?"