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Dr. Mannerheim had been working on his pet project. While he had done a lot of important work over the years, he always came back to one specific project. He didn't quite know why at first, maybe it the strange nature of it, maybe because of some fascination he couldn't quite describe, but now his reasoning was simple: he was old and it was by far the best chance for him to keep living.
He had finally managed to get it to work, and just in time for him. He found out he didn't have too much longer to live and this would be the key to extending his life.
He worked quickly assembling a trusted group to do it, getting everything in order and yet one piece remained: the donor. All hopes of getting a legitimate donor body had failed so they had to resort to less savory means.
She had been brought in as a graduate student, eager to study under him. When she was told to report not to his office but to his lab, she was even more elated. She took that as a good sign, that he wanted her to jump right into her new role. It did, but she didn't realize what her new role actually was.
Now, Dr. Mannerheim sat against a lab table, dressed in an outfit they had found in her luggage. The outfit she came into the lab in wasn't exactly in wearable condition anymore. As he rubbed his new sexy legs together, he heard the team talking about the cover-up. She had volunteered for this, they would claim, pointing to paperwork that seemed to confirm their claims. Of course, given his age his heart failed as they were grafting her head onto his body, but they were successful with him.
Quite a shame, losing such a promising young student, but that could be the price for progress. Still, everyone would point out, showcasing him with her body below his aged head, it was still a success. A qualified one, sure, but a success nonetheless.