You decided cast a melting spell on her, watching as beads of sweat form on her head, she starts wiping them away, before she stood up and was slowly sinking into the ground as a puddle of goo.
Feeling very aroused and hidden in a nearby closet peeking out through the door, you pull your dick out of your pant and started stroking and pumping it, but not too fast as you wanted to climax on her melted goo puddled body, a few minutes passed and you were nearing climax and she was nearing done melting, when her head finally melted into her body puddle of skin and hair, you stepped out of you hiding place, wand in one hand and the other stroking your dick, then you cummed on your puddled stepsister, then you casted another spell on her that reverts her back to normal in and hour, after cleaning your dick, you put it back in your pant and retreated back to your room, and putting the wand in a hiding place, this wand will give you better porn to jerk off too then pornhub itself