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At last he found what he was looking for; a bundle of parchment an inch thick, covered in the near-illegible scrawled shorthand that he used for his private notes. A pity that the work was incomplete - this would have been the best opportunity he could have been given to release this into the public domain without risk of having his name attached to it.

Not quite skincare, or cosmetics, but still perhaps of interest to Ms Patil. Maybe he could finish it soon... Snape leafed through the notes, checking to see where he had got to with his research, to see whether "finishing it soon" was a remotely realistic idea. The short heading said nothing more than 'Project Hermione' - gross sentimentality, but the notes were almost ten years old in places. He had started work on this as a distraction once he had regained his body: it was something to remember the person he had come to know, and he had intended it as a thank-you, if it had ever been finished. Thank you for returning his body intact and his classes on schedule; for keeping his secrets and for too many other things that he was unwilling to name.

Months of dealing with Muggle mopping-up every four weeks had him searching for a way to deal with the issue that wouldn't offend Hermione's concerns about interrupting her cycle. There was very little research in the wizarding world on the long-term use of potions and charms to stem the flow, as it were. It had taken some time to find Muggle research on the same problems, to determine the problems that had concerned Hermione. None of the side-effects, the consequences, had been anything that couldn't be dealt with by a half-competent mediwitch but, all the same, Snape could see why Hermione might not be entirely convinced about the long-term advisability of such things.

So he had set about devising a potion that would deal with the problem tidily, without the side-effects. But time, and classes, and extra-curricular activities involving Voldemort, meant that spare time was something rare for many years and, somehow, now that it was quieter, other things had filled up that spare time without Snape ever remembering to continue the research. Now though - well, he had the time. The Christmas vacation was coming up, and with it something akin to spare time for a while.

http://www.witchfics.org/fr2/1204.htm