Maybe a silly question  but a provider introduced me to her friend and offered a 4 handed massage for next time. I was wondering what to expect if I decide to invest the extra money. I want to know if it's worth it. Any hobbyist or providers that can let me know what happens during a 4 handed massage? Once again, kinda silly to ask but I appreciate it. Thanks!

It really depends what is going on with your current 2 hand massage. Is there BBBJ? Is there DFK?  

If the four hands can turn into two on one BBBJ or one BBBJ and DFK at the same time then i recommend going for it. For me the absolute best sensation in the world is simultaneous BBBJ and DFK. Highly recommend.

How well do you know the referring provider--well enough to trust her referral?
Does her friend have reviews?  Or, ideally, are there reviews of the two of them together?
Do you like the FF action?  If so, do you have an idea whether the two friends like playing together?  I love it when the two ladies are really into each other, so that's a big part of why I like "4 hands".
And although this is probably not just a massage you're talking about, fwiw I've had 4 hands deep tissue massages from massage therapists and it was incredible.

My guess is that the menu will continue on as is.

 
If that is just FBSM, then you'll get that times 2.

 
Do you have a relationship that will allow you to discuss sexual activities without her taking offense, then go ahead and ask if there are other things on the menu besides a massage and happy ending.

 
Above all, avoid a situation where it is a tag team and one gal takes over for the other instead of them literally using all four of their collective hands at once.   I once got snookered into that scenario at a MP, and felt I was cheated.

...was a great experience but only because the two ladies were into each other and there was some boobie/ass fondling/DFK (with one of them) allowed after the flip. So even though there was no 3BJ or FS it was still a gratifying experience.

Another example of why the term "YMMV" is so applicable to p4p. Since you have a relationship with the first provider, you should feel comfortable in asking pertinent questions before taking up their offer.