It probably sounds like too much, but I've seen it done really well in a few Japanese scenes. I think Bobbi Starr, Sammie Rhodes, Sunny Lane, and Tori Black are all perfect to work with each other. Bobbi, Sammie, and Tori have all done scenes in Jay Sin's "Pretty Sloppy" series. Sunny fits in real well, she is very passionate and has an amazing tongue. This scene would work really well even with 4 girls, because they all know what to do, and seem to love it.  And they all seem to love the sloppier stuff as well.

I also think towards the end, maybe one girl brings out a large crystal goblet full of whip cream and then the kissing gets a bit messier.  I think this type of scene would be a hot seller, and would be something a little different to possibly expand you customer base.

It's great you guys take suggestions, and it's cool you even consider your customer's ideas.