New "handle".

You arrange the portals so that your penis is now sticking out of her wall where the shower handle used to be. She reaches out and grabs your cock, then tries to twist it to turn the water back on. Her soapy hands slip right off. She keeps trying, the constant rubbing quickly stimulating you enough that you cum, jerking your load all over her face and chest.

"Must have been the soap dispenser instead of the water," you hear her mutter, as she begins to rub your spunk all over her body.