One of the major Plot Devices of "In Loco Parentis" is the Age Regression curse
Voldemort uses on Harry in the opening scene.
It should already be clear to anyone who's read the story thus far, that Snape is the originator of this curse, just as he created Sectumsempera.
Among the many ways I have neglected this story, I have never named this curse. If anyone has ideas or resources along these lines, I would be forever grateful.
And no, I am not procrastinating on writing: the next couple of scenes are written with no name for the curse. But if a good name comes to me from somewhere before I finish editing, I would love to swap it in.