The Akita mounted the bitch first, letting himself go as pumped her hard, then taking his time as he felt the knot deflate. He bit her neck hard until his jaw ached, then released her. She was barely recovered before the anxiouos and very excited St. Bernard jumped her.
The Akita slipped away from the pair unnoticed and into the living room, finding the amulet where they'd left it. Looking back only for a moment, he picked it up and slipped into the backyard, then under the fence where he'd though to dig a hole and cover it loosely several weeks ago, preparing for just such an opportunity.
The Akita made his way in the dark though the streets and out of the town back into farm country. By the time that the sun came up, he knew that he'd be missed, but it was unlikely he'd be found.
The Akita was the original Thomas, and he'd had it up to his eyebrows with the other two. It was clear that Sarah and Ian were the ones that were in love. Whenever he was in one of the human forms, even the male body that was actually his own, he never got the sense that the other one cared that much for him.
It was all the more reason why he was surprised that Sarah had volunteered to be a bitch for a while. But now, she could just be one for life.
He never wavered and slipped into the deep woods to find a particular spot where he'd long ago buried some clothes. These were not his or Sarahs, these were someone elses entirely. In the last few weeks, he'd been making plans to sell the amulet, and he'd already found a buyer. His only reason for not going forward was that he wasn't sure he could manage to get it and get away without the others knowing. Sarahs insane idea to carry a litter of pups, and then Ian's idea to help it along, were the chance that he needed.
Thomas found his cache of clothes and dug it up, then carried it to a safe place to wait until he hit the time limit and could transform. After that, he'd use the disposable cel phone in the box to call his contact, someone willing to spend millions on the amulet. Then he'd choose a final form and disappear.
And leave his former partners stuck as dogs.