This is Part 3 of the series. If you have not read parts 1 and 2, I suggest you do so now.

The girls walked around it, staring in wonder.
"Adelaide, what is that???" Someone finally asked.
"Butter" was her simple answer.
Indeed it was. The girls were looking at an enormous mound of butter, several feet tall, and just soft enough to be malleable, sitting on a tarpaulin in the center of the garden. How it got there, and who had molded it into a mound was not known, but who would be having fun with it was an easier question to solve.
As was routine by now, the numbers were tallied, and the girls waited with bated breath to see who had been the biggest slut that week.
"Chloe!" Adelaide announced. "C'mon up here, love!"
Chloe strutted up to center stage. She was dressed in a tight dress with black stockings and heels. She looked surprisingly excited to play in the butter.
"I love your outfit, darling!" said Adelaide. "And obviously the boys liked it too!" she teased.
Chloe smiled and blushed.
"What do you think, love? Should we get someone else to play in the butter with you?"
"Oh my god, yes!" confirmed Chloe. "Who's the runner-up?"
"We shall soon see!" said Adelaide, going through the papers again.
"And...it's Ella again!"
Ella stepped forward and eyed the giant mound of butter. Ella was wearing a slightly longer dress today, again with stockings and heels.
"Well ladies..." started Adelaide "what are you waiting for? There's thirty quid for whoever gets to the top first!"
Chloe and Ella charged forward and attempted to scale the mountain. Their expensive high heels slipped and sunk in the butter. Digging their hands in, they both tried pulling themselves up and ended up sliding back down multiple times. Eventually, Chloe made it to the top and straddled the mountain. She was quite a sight to see, sitting on top of a mound of butter, fully clothed, smeared with butter from the neck down. She looked quite proud sitting up there, giggling and licking butter off her fingers. Then Ella, envious of her lofty perch, gave her just a gentle push, and she slid all the way to the bottom on her bum, laughing hysterically. Chloe didn't take her dethronement lying down. She climbed back up and pushed Ella off. Ella slid down on her back, amid fits of laughter from both her and all the girls watching. Having enjoyed her previous slide down, Chloe again slid down on her bum. Then she and Ella made their way around the front of the mound where the other girls could see them better. Giggling constantly, Chloe and Ella scooped up handfuls of butter and lathered each others faces and hair with it.
"I'm gonna put butter in my shoes!" announced Chloe, as she took off her designer heels and filled them with more handfuls of butter.
The soles of Chloe's feet were still fairly clean, and she giggled and squirmed with delight as she inserted her stockinged feet into her butter filled shoes. Ella excitedly did the same. Both girls agreed that butter squishing between their toes was a lovely feeling. As they tried to walk though, both quickly discovered that their buttery stockinged feet easily slipped out of their buttery high heels, and they removed their shoes. By this point, their sexy dresses were coated in butter, and they decided to take them off as well. They rolled around a bit to get their underwear nice and buttery, before finally removing their bras and panties. Now wearing only their stockings, they turned again to the mound. Chloe once again climbed up to the top of the mound, giggling as her stockinged feet slipped and slid in the butter. At the top, Chloe sat naked atop her perch gently smearing butter onto the outside of her pussy, and lathering more butter into her hair. Ella again did the same, loving how cute her pussy looked, all covered in butter. Then Chloe gave a squeal of joy as she slid down on her naked bum, and the two girls began smearing each others naked (and relatively clean) breasts with lovely, rich butter. Chloe and Ella then took turns climbing back up the mound and sliding back down again several times. It was already fun when the two were fully clothed, but now that they were stripped down to just their stockings, there was nothing to compare with sliding around in butter naked. Finally, it was time to cake on as much as possible. The two girls were already lathered in butter from head to toe, but now they grabbed handfuls of it and literally caked each other in it.
The other, clean girls watched as Chloe and Ella, so covered in butter as to be almost unrecognizable, now completed their experience by lying back and making slippery butter angels, laughing hysterically.
The cleanup was a major project. Both girls had to be hosed off, and then the real cleaning began. In the bath, both girls repeatedly lathered each other with soap, and shampooed their hair numerous times before the buttery residue finally came off and they began to feel clean again. They both agreed it was definitely worth it though.
Even after all this, as exhausted though they were, Chloe and Ella were nonetheless excited to hear what next week's challenge was. Adelaide drew a slip of paper from the hat and laughed when she read it.
"Next week's winner will be taking a bath in a trifle!" she laughed.