Both of them felt a pervvy desire come to them at almost the same time. Eileen was the first to say it. "Ty," he asked, "...what do you think of growing and birthing the baby now? I kinda want to look after you while you're pregnant."
His offer made Ty's heart race, both because of the intimacy he offered and because she felt intrigued by the idea of having herself grow to pregnant proportions and give birth. She nodded, and felt Eileen kiss her passionately once she had.
"You're such a good girl," he smiled once he pulled back.
Ty wished for the tiny embryo inside her to develop into a newborn baby, and that her birthing it wouldn't cause her any pain.
Just as rapidly as she and Eileen had changed sexes, their progeny began developing in Ty's womb. It developed from his and her combined cells to a gestating foetus to finally a baby which could live detached from Ty herself. She saw a mental picture of how it grew, forming arms and legs, a defined head and facial features, and a sturdy torso.
Naturally she also saw how her body altered to accommodate the child. Her flat tummy bulged outward more and more, and she shivered as Eileen's large dark hand touched it softly. "I can't wait to see our pretty little caboclo," he said sweetly, and Ty blushed.
At the same time, she felt her breasts grow sensitive and tingly, and all of a sudden white liquid leaked from her teats. Mother's milk. She was lactating. It felt weird to her to recall how often, as a boy, he'd milked a different white liquid out of himself that made babies, and now she produced one that fed babies.
Ty whimpered as she felt herself lose control of the muscles in her crotch, as they ached to push something out. Noticing this, Eileen held her hand and he excitedly said, "Your water just broke!"
"Wh-wha-" Ty gasped as the contractions in her vaginal muscles started.
"You're having the baby!" Eileen clarified.
Ty knew he was right, and focused on delivering the baby as best as she could. She breathed, and pushed, and breathed, and pushed, and her anticipation continued to mount as she grew closer and closer to bearing their child.
At last, she heard the newborn screaming out as it emerged into the world, Eileen passing it up to Ty to cradle and nurse after cutting its umbilical cord. To her relief, it settled down once she had it suckling at her breast and stroking its head. She realized what Eileen meant by saying they would have a caboclo baby when she noticed the baby was mixed- and he had also been right to say it'd be pretty.