How Rob and Sistine befriended

I think that Rob and Sistine befriended becuase Rob really doesn't have any friends, and the same is with Sistine so atleast to have one friend, Rob and Sistine decided to be friends. I think that how they became friends is a whole different story. Maybe that the tiger that Rob saw was actually Sistines. So one day Rob goes to see the tiger and Sistine goes to pick up her tiger. They see each other and decide to become friends. If Rob and Sistine do become friends I think that the would be really good ones.