Step-sister's teasing sends brother out of control.
All characters in this story are 18 years or older.]
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Kevin and Dawn
Although Kevin and Dawn were step-kids, they coincidentally shared the same birthday, and had grown up with the same closeness as if they were actual twins.
After each had independently discovered the glories of m**********n, they secretly began trying to get glimpses of the other sibling naked.
Dawn was the first to figure out that her brother was sneaking peeks at her, and it gave her a little thrill to know that he found her sexy. As a result, she began giving him more opportunities to see her body, like having her bikini top "accidentally" untie in the pool, and "absentmindedly" leaving her bedroom door half open while she was getting dressed.
His b
