Well so.. I like my good friends sister and me and her hung for like 7 hours and the hole time it was just me and her together and I started flirting and she started flirting back but the thing is she is 14 and I'm 17.. plus she is my good friends sister, and well I don't know how he is going to take it when he finds out I like his sister... help any suggestions on this?

OK well when I was your age I liked a 14 year old and so there is nothing wrong with a 17 yr old being with a 14 yr old- you're only 3 yrs difference. Best thing to do is just tell your friend that you like his sister and see how he reacts. Most likely he won't mind.

Suggestions? Leave her alone... she is jail bait.

There both minors

If he is your best friend, then tell him. She is rather young for you though.

I believe that you should tell him because you don't want to lose his friendship. Also, she is three years younger than you which isn't a big age gap in an adult relationship but in a teen sense, it is quite large making the whole situation a great deal more difficult.

Fourteen is a little young honestly. I'm fifteen and my boyfriend is 17, that is almost too much. You might want to find someone else.. but it's your life.

there both minors

Your point? She is still under the age of consent. Depending on state laws, she may be jail bait.

She might not be jail bait for you now, but she will be as soon as you turn 18 depending on the state laws as Scott has stated.
You only hung out for 7 hours.
You could hang out with any girl that's attractive and gives you the right attention, at your age, for 7 hours alone and think you like her.
It's this thing called hormones. :)