He knows that the uniforms that the group wears are all special made for them and so he creates one that looks and feels exactly like the one she already has and uses his magic to replace it with the one she usually has.
The next day when she gets up and puts on her uniform she dosn't realize anything has changed until she begins to feel a dildo begining to creap into her pussy and at first she resists but after a few seconds she just gives in to the intruder and lets it
rest there. It is not visible from the outside even when she goes invisible nor does it inpead her movements. This is only the first of many changes that the suit will produce. The next being.....