I come into your room in my underwear and start doing chores which makes you embarressed because I'm your sister. I tell you underwear is just like a bikini and then realize that you've actually got a boner, and then start wanking. I'm a bit shocked but I find it funny and I mock you a little and your size but sweetly. I then start to tease you and ask if you've wanked over me and our mum before. When you're close, I start to really tease you with my ass and boobs and pussy and then when you cum I reveal I was filming it the whole time! Now you have to do my chores or I'll tell everyone that you came for me