I'be been working on one of my friends younger sisters for awhile. The trouble is she is worried what he will think. He probably wouldnt be cool with it but shes old enough to make her own decisons. Whats the next step I should do?

Its a matter of your own morals. You need to decide whether you want to risk going behind a friend's back, or if you want to risk telling him about it, or whether you care more about your friend and stop going anywhere with the girl. You need to decide that on your own though.

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"The 'Brick Walls' are there to allow you to prove how badly you want something!" ~ Randy Pausch

~ Rye

In my opinion its really not worth it man, theres many many girls out there but he is your friend you know? i wouldnt do it..

if he's a good friend of yours, you need to back off IMO

Bros before Hos.
You said he wouldn't be okay with it, but if you really want her, then be straight with him about it before you go for it. No vaj is worth losing a friend over.

Now if he's okay with it, but she's worried about what he'd think, just build more comfort. I would think that it isn't really that big of an issue to her, but it's more of token resistance? Of course she'll worry about what other people think, especially her family, but if you play your game right, her attraction for you will prevail.

I would think if you are serious about a relationship with her then go for it. Lets be real, we all know the "stay away from my lil sister" act but in reality most guys should actually WANT their friends to date their sisters. Your friends are your friends for reasons: trust, compation, etc. Why wouldnt u want your sister with somone u know IS NOT an asshole.

However, what most guys WOULD NOT like is for a friend to get on their sister, F close it, then ditch her. That would be a very nasty thing to do.

So i say if its for a serious relationship go for it. If its to just F close her then keep away.