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One day...I thought she was doing her homework, so I peeked in and saw my sister rubbing her clit on the corner of the desk...At first, I had no idea if she was doing it...if my clit were itchy. I thought I should scratch it with my hands, but then my face gradually became ecstatic and I started cumming...Is this some kind of ecstasy? Was my sister experiencing orgasmic ecstasy on the corner of her desk? !