We are having a pair of sisters join us for some messy gameshow fun what kind of game should we have them play!?!?!

Guess the Mess! Have them lie down wearing bikinis or nude and dump all kinds of savory ingredients all over their bodies and have them guess what they are. Similar to what you did with Vika. I'd buy that instantly!

Something involving plenty of pies

Maybe something inspired by games played at birthday parties and involving birthday cakes.

Coin Flip Human Garbage Disposal

Bride Wars: both wear long dresses(yes, I have a problem) and whoever turns the dress totally white first using what's available wins. Loser gets a seat in the gunge tank and/or a couple pies. Each gets one use of the hose to spray the other as a sort of wild card.

Also something like the WWE Armageddon evening gown swimming pool match but instead of a swimming pool they're mud wrestling.

A memory game?
Maybe a tray full of messy items , contestant has 60 seconds to memorise the contents, which are then covered or removed, every item she forgets, she wears.. increasing in difficulty each time. Five items, tgen ten etc.

Alternatively , if there are two contestants, the player gets to wam her opponent for every item correctly remembered, and tge opponent gets to wam the player with anything she can't remember.
You could also use the host to stand in for an opponent if tgere isn't one.

A memory game?
Maybe a tray full of messy items , contestant has 60 seconds to memorise the contents, which are then covered or removed, every item she forgets, she wears.. increasing in difficulty each time. Five items, tgen ten etc.

Alternatively , if there are two contestants, the player gets to wam her opponent for every item correctly remembered, and tge opponent gets to wam the player with anything she can't remember.
You could also use the host to stand in for an opponent if tgere isn't one.

Jeopardy with mess!

* Pies of Fortune (Bonus Round)

The ladies have to fill in the letters to a mystery phrase (like, say, "ALANA IS HOT") and win a pie every time they get a letter right. (The girl who guesses "A" here wins 3 pies!) The girl who solves the puzzle wins a bucket of slime.

* Can-centration (Too hard to explain, so here's a scene)

Girl 1: 22 and 6.
Alana: (reads) Tomato Soup and Creamed Corn.

Girl 2: 4 and 17.
Alana: (reads) Rice Pudding and Tomato Soup.

Girl 1: (excited) 17 and 22!
Alana: (reads) Tomato Soup and Tomato Soup! It's a match!

Girl 1: YAY! <gloop> (gets covered w 2 cans of tomato soup)</gloop>

One of my favorites from the standpoint of suspense is this: one girl is given a topic she has to talk about continuously for 60 seconds, and if she stops, she gets pied/slimed/whatever. But ALSO there's a secret word related to the topic that results in a pieing/sliming/whatever if she says it.

My suggestions is very simple. A question game and wrong answer = pie, pie sandwich or strip. If none of the sisters answer, both get pied. If the video has full nude, in the end the loser gets slimed full naked.

Simon says.

Except the Simon keeps instructing the others to mess each other up or them selves.

Loose is the one that does something without "Simon Says" or laughs. Winner gets to be next Simon

That would be awesome.

Yucky mess competition.

Give them both a budget, and they have to get the yuckiest and mess they can for that budget.

Alana chooses which is least worst and gets covered in that. The loser then gets gunged by the worst mess.

Then shoot 2 is a revenge shoot - lol.

Egg russian roulette

Cake sitting musical chairs

Personally, I'm quite fond of something simple like a trivia game. Right answers get your opponent pied, wrong answers get you pied, and whoever gets pied most also gets gunged at the end!

How about to make a game show like this?

https://youtu.be/ae9b4C7H5_E

Panty filling trivia game where each wrong answer results in their panties being filled with more mess. The sister with the most wrong answers at the end gets a big messy wedgie.

Messy cooking contest! Each prepare a starter, a main course, and a dessert. You taste them all and the loser gets all the prepared dishes dumped on them/down their pants!

Tie one's hands behind their back and blindfold the other. Mess the tied one up with something, and have the blindfolded one taste it. If she guesses the substance, the cuffed sister stays tied up and gets the next bucket. If she fails, their roles switch.

A high card low card game.

It's a while since you asked for suggestions, Have you recorded yet? if yes any stills from shoot?