Deeps

My girlfriend and I are having a getaway weekend with her friend and boyfriend and the girls discovered how freaky they both are. So were are going to play a sex game and get into watching each other fuck and play around. Also, the girls seem interested in touching each other while we watch. Is this ok for soft swapping? Not interested in any type of full swap. Also, we would like to get into bondage. Can that be done together without other couple involved? Any suggestion big help