Set You Free

Based on "Y Tu Mummy Tambien" but set in Season 2 after Prue's emotional breakdown after Andy's death... Her little sisters are in danger thanks to a warlock. Prue & the warlock have no way of defeating the other, since Prue is pregnant with a magical child & the warlock can only be vanquished with the Power of Three spell. You know the catch though, she can only pick one to save.