Thanks to everyone who replied to my inquiry regarding sisters! It's just that, well, twins are a different kind of thing. They tend to think alike and it's not that unusual for a set of twins to be very similar sexually. No, I'm actually looking for a younger and older sister kind of thing. Where, yes, they have a family resemblance but are really different people. Each unique in her own way. As you might guess, I'm involved with two sisters myself, and I think this is what's behind my infatuation. Again, any help will be appreciated.