A month had passed and the day of the rematch had at last arrived. Rias had rented a large mansion and customized it to fit what she had in mind for this rematch. She waited patiently in the foyer for Akeno to arrive, already naked. She played with herself as the anticipation was too much. Finally, Akeno walked in the door, naked herself as she and Rias stared each other down in lust. They came close to each other and kissed, playing with each other's hair.

"The time has finally come." Rias said.

"It won't be the only thing coming." Akeno joked. "Now, let's fuck."

"Wait." Rias said. "I need to explain the rules first."

"Rules?" Akeno asked.

"Yes." Rias answered. "Xenovia gave me a lot of very interesting ideas."

"First of all, the entire house is full of hidden cameras that should capture every delicious angle of our game."

"Ohhhh." Akeno purred. "You naughty little slut."

"The videos aren't just for our enjoyment." Rias said. "They'll be shown to Issei and he'll be the judge of who won?"

"I thought whoever outlasted the other would win." Akeno said in a disappointed tone as she played with Rias's hair.

"We will go until one of us can't anymore." Rias corrected. "But stamina won't be the deciding factor. Our boyfriend will choose whose performance he thinks was better and who turned him on more."

"Oh, I see." Akeno said. "So, why this big mansion?"

"We will stay here for an entire week." Rias said. "We will fuck, dominate, get dominated, humiliate and degrade each other in every possible manner that there is."

Akeno moaned as Rias flicked her nipples.

"There will be everything. Messy foodfights, wrestling, messy wrestling in all kinds of different substances, kissing, fingering, fisting, groping, licking, sucking, riding, 69, hair-pulling, titfighting, showers, mud, oil, baths, massages, swimming out in the pool, masturbating, squirting each other and God knows what else."

"Oh, you little slut!" Akeno said in surprise. "I never knew you had it in you!"

"Xenovia gave me most of these ideas, actually." Rias said.

"Oh?" Akeno asked. "Seems our little church girl has quite the other side to her."

"As I was saying." Rias said. "We will embrace our inner sluts and put on the greatest marathon show of Issei's life. He'll watch all of it. And for the record, while we can take breaks whenever we want, we can each go after our oppnent whenver we desire, whether they're on break or not. The sexfighting could happen anywhere, anytime, for any reason, using anything we can get our hands on to exploit and objectify each other."

"Ohhhh, baby..." Akeno moaned.

"And the winner will get to have Issei to themselves for an entire week." Rias said. "They can allow the loser to join in and be the sub if they wish."

"Good." Akeno said. "I'll have Issei blowing loads in me and I'll let you lick it out."

"In your dreams!" Rias retorted. "I'll have Issei drench me in his cum and you'll lick me clean!"

"Well, what are we waiting for?" Akeno asked. "Let's get on with it!"

"Alright, whore!" Rias said. "The marathon sexfight to end all marathon sexfights begins now!"