Brunette teen is watched by her brother fucking her ass with a dildo till her legs shake

I have always suspected my brunette teen sister was masturbating when she was home alone. So I bought a camera and hid it somewhere in her room. She got home today horny as usual, she takes out her dildo and fucks her tight ass till her legs begin to shake. I could not believe how hard my cock got from watching her fuck her ass hole with this dildo