Do your homework. Do your homework. Is that all Beckie can think of? Of course, there is a backlog from that week you spent in her belly. Even if you did manage to do some of it, there is still a lot to do. But the fact Beckie might be right doesn't excuse her harping on it. In fact it probably makes it worse.
It gets worse when she finishes her homework, and asks you if you need any help. Well, you do, but you are certainly not going to admit it to her. And then she goes and starts playing around with Rickie when you deny it! You are furious, but there is still homework to do, while you stew in anger.
Finally you are finished and you turn to see Beckie happily asleep atop of Rickie, having just finished some erotic behavior. That is it! Time to do to her what she did to you.
You massage your loins. The nurse said you would be good at this and Beckie managed it, so you should do it fine, but you want your most sensitive spot well lubricated. It is going to get plenty of abuse in any case. The thought of trying to unbirth Beckie turns out to be quite stimulating, and you have a powerful climax very quickly.
Next you pick up her feet and shove them into your passion-moistened depths. The feeling is exquisite, and terrible. Somewhat naturally. Nothing nearly as large has ever entered there. Of course your other orifices have managed to handle much bigger loads without this pain, or thrill. Still, it seems only reasonable that here is the most intense reaction. You start working your way up her calves as your feelings intensify.

Beckie of course wakes, and can’t resist asking “What are you doing?” Dumb question.

“I’m returning the favor. You unbirthed me. So I am going to unbirth you!” You are not sure whether to scream in pain or joy, but for the moment you are not going to do either.

“But darling, you’re so young. You are not ready. Wait until you are a big girl.”

That of course is entirely the wrong approach. You are a big girl, at least as big as Beckie. “I’m as old as you are, and you managed it.” As you pull another inch of her inside, and gasp from the sensation.

“I don’t want you repeating my mistakes.” Beckie argues.

“I won’t. I’ll make my own.” This time you can’t suppress your scream.

“See, you’ll just hurt yourself. Now please stop…” But she should already know it is a really good pain. You are enjoying every second of it. And she is too. She too is stimulated by the contact and your next scream is matched by one of her’s.

Despite the obvious danger of her clenching her teeth, Rickie wants to join in, and Beckie lets his member into her mouth. Somehow she manages not to bite it off despite several organisms. Your own are coming in waves now as more of Beckie slides in.
You slow down as you reach her hips, which seems impossibly wide as they go in. But they go in. Success! Beckie had needed help to unbirth you. But you are going to succeed all by yourself. But it is hard to focus on this as you are being overwhelmed by both pleasure and pain as more of Beckie’s torso goes in.
Finally, you are to her breasts. Beckie unmouths Rickie, to his sorrow, and starts trying to flatten her breasts so she can slip in easier. You try to tell her you don’t need the help, but you are not sure you are able to say anything coherent. In any case, Beckie ignores your request.
Now her nipples tickle their way in. After a few more squeezes get most of the rest inside, Beckie extends her arms over her head, slightly narrowing her shoulders and allowing the rest of her to go in easier.
As her head goes in, she warns you “Now be a good girl, daughter.” You are feeling too tired to object and concentrate your last strength on getting the last of her into your womb and getting Beckie into the proper position.
Then that is done. As Rickie climbs onto you to unite with both you and Beckie, you can only mutter “I’m going to have a baby, a darling daughter…”