You went to your sister's room to tell her that your girlfriend is coming to your house and you are surprised to find her totally naked. What's the big deal bro? She is about to take a shower and it's her room anyway! She flirts with you asking if you want to shower together. What? Your girlfriend is coming? Why do you even need a girlfriend when you have your hot sister? What? Your sister has to give her room to your girlfriend? That's too greedy! First she took her bro and now she wants her room? Fine! Your sister agrees to give the room, but only AFTER she makes a mess! She has been wanting to pee for quite a long time, so that works perfectly, time to empty her bladder all over the room! Oh yeah, that felt soo good! Now your girlfriend can have it! Do you want to lick your sister's pussy clean? ;)