Rias was sitting in her office at the Occult Research Club doing paperwork when suddenly, Xenovia walked in and stood in an upright position to show respect to her superior. Rias ogled her in her skimpy school uniform for a bit, staring longingly at the skin tight top, the knee high socks and the skirt almost small enough to belong to a Sailor Scout. Suddenly, Xenovia spoke up and broke her horny president out of her lustful trance.
"You wanted to see me, Madam President?" Xenovia asked in a somewhat nervous tone, likely thinking she might be in trouble.
"Relax, dear. I just need your help with something." Rias said in a cheerful tone.
"And what would that be?" Xenovia asked in a more relaxed tone.
Rias then explained the entire thing to Xenovia in vivid detail. How Akeno tried to seduce her in the bath after fucking Issei on what was supposed to be their special night, how it lead to a sexfight between the two of them, how Rias lost, how they made up but still agreed to a rematch mostly just for fun and how she needed to practice with Xenovia while Akeno would practice with Rossweisse. It's a good thing Xenovia wasn't sitting down or the chair would've been soaked with her juices.
"So, will you help me?" Rias asked as she brought herself into Xenovia, their faces inches from each other as Rias played with her acolyte's blue hair.
"If I might ask mistress, why me?" Xenovia asked.
"Because Irina told me all about the little escapades you two and the other girls would have." Rias replied as Xenovia blushed with shame.
"It's nothing to be ashamed of." Rias said. "Even women of God have urges. It's only natural."
"Thank you, mistress." Xenovia said. "And yes, I will help you."
"And this will all be our little secret." Rias confirmed.
Xenovia regained her composure and her usual serious expression returned. Suddenly, Rias enclosed on her and locked lips with her. Her brief surprise quickly dissipated as she returned the kiss longingly. The two busty babes moaned as they passionately tongued each other's mouths. Xenovia brought her hands behind Rias, running her hands through her endlessly long red hair. Rias brought her hands down to palm and knead Xenovia's ass. They continued making out for about ten minutes before Xenovia suddenly broke their kiss.
"Mistress, do you think we should go somewhere more private and comfortable?" Xenovia asked.
"Of course! I don't know what I was thinking!" Rias said. "We don't want someone walking in on us."
"I'm sure Issei would love to walk in on us." Xenovia joked making Rias chuckle.
The two girls managed to sneak their way into the girls locker room at the school. It was Summer Vacation, so they knew nobody would interrupt them. They both undressed, their massive, bouncy tits jiggling like jello with even the slightest movement. The sight of each other naked drove them both insane with lust, to the point where they couldn't take it anymore and collided into each other, resuming their makeout session. They twisted tongues for about five minutes before Xenovia pushed Rias into the showers and lowered her head to suck on her gigantic tiddies. Rias then reached her hands over to two seperate nozzles to turn the shower heads on. The two beauties were drenched in seconds as Xenovia switches to suck on Rias's right breast.
Rias moaned as Akeno flicked her tongue against her nipple while kneading her left breast and pinching that nipple. Xenovia then lowered herself down even more until she was face to face with Rias's lovely pussy. She didn't waste any time and dove her lips and tongue right in. Rias nearly screamed upon contact, her hands on Xenovia's head, pushing her lust crazed acolyte further into her cunt. Xenovia slurped, kissed, licked and even bit as Rias's clit, overwhelming her mistress with pleasure. She then brought her fingers into the mix, sliding one, then two, then three, then four and then her entire fist in and out of Rias's entrance. Rias screamed bloody murder as her face flushed and the pleasure was so overwhelming that she couldn't even catch enough breath to tell Xenovia that she was about to cum. She moaned as she squirted all over Xenovia's face, hair, breasts amd stomach. Xenovia finally pulled out as the two babes laid in a pool of shower water and Rias's juices, desperately trying to catch their breath.
"Wow..." Rias said. "That's just what I need. To build up vaginal stamina so I can stand against Akeno's pussy. Thank you, dear."
"It was more than my pleasure, mistress." Xenovia said. "Now where were we?"
The shower pelted down on them, matting Rias's long, flowing crimson hair to her back as Rias pounced on Akeno, knocking her to the tiled ground as Rias got down on her stomach and ate Xenovia out, making her moan.
"Just returning the favor." Rias said with a chuckle. "It wouldn't be fair if I was the only one getting my pussy stimulated."
Rias rammed her tongue into Xenovia's cunt, licking and spitting into it as Xenovia cried out in pleasure and pulled on Rias's beautiful wet hair. Her hair being pulled sent Rias over the edge as she serviced her acolyte's ripe pussy. It only took about two minutes until Xenovia soaked Rias's face and hair with her pussy juice and they once again pulled back to catch their breath.
"I'm sorry, mistress" Xenovia said in between breaths. "My pussy isn't as resiliant as yours or Akeno's."
"Oh, don't be so hard on yourself, dear." Rias said. "You taste delightful and your pussy eating skills may even rival Akeno's."
"Thank you, mistress." Xenovia said as she pulled Rias down on top of her, shoving her tongue into her mouth as their breasts and pussies collided into each other.
The two Goddesses humped each other while making out as the shower pelted them. They continued for about ten minutes until Xenovia came and then Rias about three minutes later. Finally, they decided to call it a night. They turned the shower off, dried off and before they got dressed, Xenovia suddenly had an epiphany.
"Mistress, if I may, I have a few ideas for how you can go about your rematch with Akeno." Xenovia said.
"What did you have in mind, dear?" Rias asked.
Xenovia then whispered into Rias's ear as she played with the redhead's flowing locks. Rias could barely keep herself from giggling as she heard Xenovia's proposal.
"Oh, you dirty slut." Rias teased as she gave Xenovia a kiss.
"Well, what do you think?" Xenovia asked as she ran her fingers through her mistress's hair.
"I think I'll do just that." Rias said.
The two girls hugged, kissed for about thirty seconds and then finally got dressed and left, eager for the day of the rematch.