go to upstair to take a shower

you go upstair with in mind to take a shower and change. you take out your clothe in your room and grabe a towel then go back in the corridor, direction the bathroom. when you arrive to the door you notice is not close but you hear the water running, its seem somebody already in, you know tom and sophie are downstair so it can only be sarah your ex girlfriend, you dont miss you relation with her but man what a body she does have...