They move in

Feeling lonely, Heather and Antonio moved in with Helen and Hannah, realising that these girls had also come into their new forms, just like Heather had.

• While Heather had slightly droopy and microscopically smaller tits, she was far more muscle-bound, with a slightly protruding clit.
• While Helen seems to have more folds, visible veins on her enormous tits, and some cellulite on her thighs, she was far more connected to her milf and motherly energy, making every part of her irresistible, and pridefully rehabilitating 17 young men she calls her boys using her motherly energy.
• Although her tits are more like bananas than balloons now, Hannah has gained some tattoos and become a far better tease while maintaining the perfect ratios of flesh in all the right places for her tanned body.
• Although he used to be taller, had more meat on his bones, and seemed like a pushover, he was now super girly, submissive, and happily wore women's clothes exclusively to hide very little of his body. He had also shrunk a tad while his sisters had grown even further, feeling especially meek when Hannah was involved.

(See page 23 of Antonio & the Linder Sisters doujin for a picture of what I'm describing)

Things had changed a lot since Antonio had visited, but that didn't seem to deter the girls and the affection they had for him so long ago.

When Antonio and Heather leave to go workout, Hannah and Helen would team up in impossibly revealing dresses and shoes to tease and entice him, leaving him to imagine all the things they'd say and do to him to make him cum. While Hannah would call him a girl, sissy, and a million other things playing to his new submissive kinks, Helen would treat him like a literal child and try and raise his spirits, with both of them giving him a little kiss or blow or air to the ear to make him cum without skin contact.

Likewise, there are many other situations that make him almost fall to their corruption, barely staying strong until that fateful day when things finally changed.