My sister, a delinquent with no sense of fashion, was invited on a date by a serious guy and came to me for advice! I advised her to wear cute clothes, and she bought a tight knit dress! Her unusual look and sexy body lines made me get an erection, so I forgot myself and inserted my dick! I thrusted my dick hard and came inside her, and my sister was furious! But then... she was so happy that she asked for a creampie and had multiple orgasms! My delinquent sister turned into a tsundere erotic girl!