POV: i am your sister and already in your room naked when you enter.
We're also a couple and i want to have some fun...
i want to see who can make the other person cum first!
i claim that i know i am going to win, so i decide to "give you a chance" and let you take me in missionary first
i am enjoying it a lot and decide that i better take control before you win!
i flip you over when you are not expecting it, pin you down and ride you, asking you why you are making those faces (like i know you want to cum)
you push me off and lay me on my back to eat me out. and i love it.
i wrap my legs around your head and squeeze, telling you that if you are going to eat me out then i am going to blow you.
i make us get into the 69 to make it "more fair" - you still having a view of my pussy so you can lick while i blow you off camera.
After a little bit, you throw me off again and get in doggy (with my entire ass in frame), face down ass up
you know you are going to make me cum like this because it's my favorite position
i twerk as we fuck, and i am moaning and groaning, getting closer
i remind you that it's your favorite position too and i speed up hoping that you will cum first
you start slowing down and i know you are having a hard time handling it
you try to stop but i reach between my legs and grab your balls so you can't pull out
you cum inside me and i cum right after you do
i tease you a little about "losing" but it's obviously in good fun, and i let you know that you can get a "rematch" any time

This is definitely something you won't want to miss.