You should be ashamed of yourself. No matter how bad you think your sister is it's wrong to let your friends watch her on the toilet or for them to see her masturbating. Those are very personal things and should never be seen by anyone including you. Imagine how you would feel if her friends saw you grunting away on the toilet and I don't think you would like it if they saw you masturbating and later were telling people and mocking you.
Do your sister and yourself a favor and don't do this anymore and never tell her what you did because believe me one way or another you will regret it.
Are you the same little bastard that wants to know how to masterbate on another thread? How dare you do that to your sister, people like you pay a hard price in life for things like that.
Remeber this... Something bad is going to happen to you in the future and you are going to think back on this, don't laugh or think its funny, just wait until your pain and tears come down. It might be physical or emotional but you are gong to pay for this. Trust me.
what bullshit. any holes that aren't going to be obvious are probably not going to be in any place that would do any good to get you a good look.
you're full of shit!
Show us a pic of her on the broom! LOL