So I like this girl she's really pretty and smart and I love her personality... but she has a twin and although she's just a little prettier and smarter I still want the other one. However they both have bf's and towards other guys they are naturally flirtatious but they aren't towards me. I just want to know if maybe they could be secretly sending me signs or if I should try to send them signs... by the way I'm a shy guy.

They each have a boyfriend and are off limits to you. No flirting with them! Find an unattached girl to flirt with.

Even if they send you signs, which it doesn't sound like they're doing, they're both in relationships, so they're off limits.