Step-Brother and step sister share the same room

Mom and step-dad are in the other room while my step-brother and I get to share our hotel room... I didnt think that we would end up in the same room, so I brought my sexy silk nightie for bed. But now I think that it wasn't such a good idea since my stepbrother cant keep his eyes off of me. "what a perv" even if he is my stepbrother its just so... wrong, for him to get aroused like this for me. His step sister! Laying down next to him and seeing how his penis just gets bigger and bigger by the second while we watch tv in the room at night is quite amusing I must say...its making me a little horny thinking about what his cock must looks like... I know I shouldn't...being here the two of us alone in our own hotel room is just a once in a life time situation... I lean over and whisper in his ear if he would like to see my new blue high heels that match with my satin nightie?...and guess what he said?....