She would first be surprised looking at someone inside while she is naked, she would probably cover herself but if guy was naked and pull out his dick she would act like she is shocked and confused what the hell is he doing but she would be very interested and she would not be able to hide her eyes off it. She would uncover her pussy and boobs and probably would show him the way out of the bathroom with smile and giggles and then if he would be persistant she would ask him what the hell he wants and if the guy aproach her and starts touching her boobs and ass giving her compliments she would still act shocked but would be aroused and wet and knowing her she would accidentely touch his dick and make shocked face how big it is, and then they would kiss probably and after that she would go on knees and start sucking his dick, fucking and other things, as she is in the bathroom she would let him make her dirty and cum all over her everywhere and everything would look like she dnt want it and he would do all job, like he is in control so she dnt look like whore but instead inside she is.