The Girl That I Like And My Cousin? (10 Points)?

Usually girls tend to develop feelings for their best guy friends, I think that your cousin is just pissed that he didn't get her! If she asked you to check her , she was probably flirting and trying to find a way for you to look at her . All I can say is go for it but don't rush right in unless she shows definite signs. Start slowly like giving her a daisy or some flower and see how she reacts, then if it looks positive you can ask her out or something.