Does she like me?!?!?!?!?!?!?!?

Well this is rather creepy i know but I'm falling in love with my best friend's younger sister she's only two years younger than me so i'm not a major pedophile ok? we hang out at school not really a lot but sometimes we always laugh and have a good time well last night i went over to my friend's house for a superbowl party she sat next to me the whole time, we talked, laughed made jokes. then today at school she sat down next to me and we started talking again lke we did on sunday. Does she like me?