Commissioned: It's in the Doctor - Part 3 by Doc000 (Patreon)

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Sequel to Part 2. Recap: dowdy Professor Helen Suchswell found an ancient artifact sex toy and used it on herself, which transformed her slender body into a sexy bimbo and possessed her. She found herself with a massively increased sex drive, so slept with the Janitor.

Well, it seems she's not had enough yet! Making an appearance is newly-named Karly, who appeared as one of Eliza's "bad girl" posse in this other commission from Doc000. This establishes that Dr Suchswell is a professor at the University that Riley attends, so there's a possibility of the two meeting someday...

Note to Patreon: That first panel insinuates that something pretty bad is happening, but it's not what it seems. Please don't judge based on that panel alone, the rest makes it clear.