Golden shower.

You displace the showerhead also, then use the portals to stick your penis in its place. As the woman continues to flail about, you release a stream of pee down onto her. Feeling the warm wetness, the woman shrugs, then rinses her hair with your urine. You run out just as she gets her eyes clear, and she opens them to see your dripping cock hanging from the wall in front of her.