"The nurse of course." Says the Nurse.

"Oh, well, why can't I see your throat?" Asks Rei.

"You aren't in my stomach, my dear, you are in my womb. You and your friend feel so good in me, I want you inside for longer than digestion allows." Adds the nurse. "Now then, I give you an option. Unbirth your friend, I'll tell you how." Or I'll get her out and unbirth her myself.