Series It turned into a sister bowl, but did I do something wrong?

I ended up with a threesome of sisters, but did I do something wrong? I broke up with my girlfriend and started dating a girl who looked just like my ex-girlfriend, but it turned out to be my sister. When my older sister saw that, she went crazy with jealousy and we ended up having a threesome of sisters. The super-breasted version where if she gets pregnant first, she can get married.