My sister, so engrossed in masturbating that she doesn't notice me watching, is a virgin yet deeply engrossed in a thick dildo, panting like a pro and thoroughly enjoying herself. Excited and erect by the sight, I attacked her from behind! Instead of being rejected, she brightened up at the sight of a real penis for the first time and climbed on top of me, saying, "I want to try inserting it..."!?
