A couple members of staff tried to redress Maria in the underwear she had arrived in. The pants still barely fit, stretched out over her thicker thighs and wide ass, but the bra was a little more depressing. With the continued growth of her new breast at the bottom of her stomach, her regular ones had deflated, so it now just hung there loosely not even close to filled out.
One she was sufficiently 'covered' she was escorted out of her cell, arms held on each side by guards. She didn't really think it was necessary, she would do as she was told like a good horse now, but she enjoyed the contact and manhandling regardless.
The scientist led the way along a maze of hallways as Maria and her escorts followed, the loud stomps of their boots broken up by the light clopping from her hooves. They walked up a long ramp with a bright light at the top, and then emerged back into the outside world.
Maria was still marched along as her eyes adjusted to sunlight again, until everyone stopped. She couldn't quite tell where she was yet but was suddenly shoved and fell down a small drop. Dust kicked up from her landing, but she could make out a large amount of green around her.
"Enjoy your new home Maria, we thought it only fitting you be kept with the other animals" the scientist laughed from above. Footsteps followed as they left her behind.
Her eyes finally finished adjusting and she could take in her location. It was a large field, with other horses. They all kept their distance, weary of the intruder. Maria picked herself up to her hooves and brushed herself down, then threw her bra to one side. It had mostly come off in the fall anyway, and there was barely any breast left to hold it in place. She gently rubbed at the now bigger pair, as she looked around trying to decide what to do. The metal railings around the edge of the field weren't very tall, she could probably easily climb them if she wanted to.
Maria trotted over to it and considered making a break for it. But she couldn't, she felt compelled to stay, so she stood there leaning against the fence, looking out into the distance.
It looked so beautiful and inviting, but she had to stay here, and do as she was told. The thought of gallivanting in this field, eating grass and hay, sleeping outside, getting to know the other horses, all just felt right.
And it turns out she'd be getting to know them sooner rather than later, as she was startled by a light brushing past her ass. She looked behind her to see a large white horse sniffing at her backside, and past its face, she could see a cock expanding underneath it.