So this would be a Viera bonding ceremony, where two people would be bonded together, and have intercourse, assisted by the other vieras taking part on the ancestral tradition, applying lotions, giving foods and beverages and assisting.
As it goes on, it would be normal for other vieras in the croud to, due the arousal, start enjoying themselves with other partners, and is most possible the whole party would end up in a nice warm collective orgy.
Naturally, the vieras wouldn't engage in the bonding partners, but if those were to be open to share the sexual experience--- well you can imagine.

Me and Aidenke haven't talked on whether Fran and Penelo would join the group-sex with other vieras, or stay to their own, so i guess it's open for imagination! hahaha

Anyway
Hope you people like it!