I Love My Twin Sister

There were two kids that were born together, twins. The other twin is a boy named Dwayne and the other one is a girl named Dianne. They grew up together and then Dwayne slowly falls in love with her sister. After that night he kisses Dianne, he began seducing her. Then there's a THIRD WHEELER!! He wants Dianne for himself. One day, he kidnapped Dianne and Dwayne rescued her. Unfortunately, Harold, the third wheeler, almost stabbed Dwayne but Dianne protected her beloved brother and died. Will they be happy when Dwayne hadn't fell in love with his sister? Or will he regret loving her when his sister's always by his side?