I think the dancing started out as alcohol fueled harmless fun like it usually does and the pasties were a bit of costume play, I think belle managed to get herself a little worked up during the dancing, I think while they were dancing they were monitoring sites like CC and ran out to the balcony on the spur of the moment and decided to have a little fun with RLC members watching the festivities, at which point the faux lesbian sex occurred under the covers. Even though it was most likely simulated sex I think there was some physical contact made as Belle was visibly aroused even after she went to bed and tried to bate.