He retrieved the pouch with the metal hoop that had been enchanted as a portkey between his mansion and the school. Careful not to touch the hoop itself yet he walked through the mansion and out the double doors to the front lawn. Dumbledore had arranged for the portkey once it became clear, during his second year at Hogwarts, that Tamblin needed an anchor. Cascata was the logical choice. The only choice really. And she had accepted readily.
Last summer she had come to the house for their visits. But the knowledge that his mother was still around and surely trying to re-establish a connection to Cacata made Tamblin uncomfortable with bringing her here. It was foolish since he knew that there was nothing preventing his mother from traveling to the school. He'd told Cascata that he would visit her there because he had too much to do at the house. If they wanted to actually do something together he'd have to leave it all behind. She accepted this but with a definite uncertainty.
The truth however would have been too dangerous. His mother's hold had been broken by erasing all of Cascata's memories of the woman. Anything that might return those memories threatened to re-establish that hold. Cascata's best friends had maintained a conspiracy against her finding out the truth of the previous year. That the conspiracy was as much for her benefit as theirs didn't make it any easier to lie to her.
Tamblin took hold of the ring and was flung through space. Portkey travel was fast and convenient for those too young to apparate, or those going some place proof against apparition like Hogwarts. Below him England's countryside sped by much too fast for him to keep track of. Hogwarts was somewhere in the north, in or near Scotland. He wasn't quite sure exactly, but far from his own home near London proper. Within moments he landed on the lawn in front of the great doors of Hogwarts castle. The portkey had originally transported between his own home and Cascata's dormitory, back when she'd come to see him. Once the roles had reversed Dumbledore altered the magic to prevent any "untoward appearances" he had said.
Dusting himself off, Tamblin looked around and didn't see Cascata anywhere. Their visitation was pre-arranged and she'd always met him here previously. He looked up at the great mass of the castle and its' out buildings. It was very large and had a grandeur that had impressed him since he'd seen it as a first year student crossing the lake on those wretched boats. During the school year the castle would bustle with dozens of students in each of four houses as well as the teachers, staff, house elves and so on During these summers it was fairly deserted. The house elves remained to take care of those few of the staff that didn't leave- and two students.
Cascata remained at the school because she was estranged from her muggle father. The man had married a witch. She had died. The father lost a wife. The daughter lost a mother, and more. When Cascata showed sign of being a witch the father turned away from her. She said that it was too painful for him to be reminded, and he had remarried, this time a muggle.
The talent Cascata was born with meant her life would change and never be the same. She would leave behind a father and a younger sister. That sister would get a letter by owl two years later and the cycle would repeat. It might have been a happy day for Cascata, being reunited with a sister she thought lost, but young Callista Vega had convinced herself that it was somehow her sister's fault she was a witch. If losing her family had hurt Cascata before, having her sister at hand but out of reach was worse.
Callista's sorting into Slytherin hadn't helped. It had introduced her to questionable influences.