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I would NEVER do this with friends or people I knew. Too much chance it'll be awkward or something will go wrong and you'll never be able to look them in the eye again. Much much better to do this with people you meet online, I'd keep it ALL online/webcam if it was me but you could also use the internet to find local people willing to meet up (always a risk!)
I know someone who tried a foursome with another couple they knew & her husband ended up leaving her for the other woman! Not that that's definitely gonna happen of course, but just some anecdotal evidence of it not going well!
Hide the sausage
Sounds kind of fun!
I'd say you could kind of makeup your own games. Spin the bottle. Strip poker etc have fun guys!! And be careful :)
Spin the bottle and make your own rules
Strip poker (or strip [insert any game/board game here]), spin the bottle? I'm sure you could find a Reddit sub or something to ask this question to, and receive advice.