A black guy

The knock is followed by a man's voice which says "Nicole are you in there? I need to take a piss can I come in?" He obviously thinks that it is your older sister in the bathroom.

You just stand like a deer in the headlights, not sure what to say or do there is a stranger outside of the bathroom and you are a naked blonde chick. What will happen when your sisters find out, will they even believe that you are telling the truth about being their brother? This is all so overwhelming you sink to your knees on the floor. As all of these thoughts go through your head the voice outside the door says, "Hey if you are in the shower I am going to come in really quick."

And with that, the door swings open to reveal a hot guy wearing just boxers with a huge cock hanging down his leg past the edge of his boxers.

As the door opens he looks down at you and says, "You are not Nicole who are you."

You can't think of what to say with that huge cock hanging there, you always been bisexual so you are completely mesmerized by the cock, so you say the only thing that comes to mind, "I am her sister. Please leave."