The girls walked out to the backyard, where the mud pit was waiting for them. It was a hole in the ground that Rias had her servants dig up, fill with dirt and then spray with a hose until the dirt turned to nice, viscous mud for her to wrestle Akeno in. The backyard was massive. The size of three football fields at least and therefore, the mud pit was also large. Big enough for all of Issei's girlfriends to wrestle in, which Rias likely did on purpose in case any of the other girls step out of line or as birthday/Christmas gifts for her boyfriend.
Without saying a word, the girls, having just cleaned themselves up from their food fight, were ready to render that pointless by getting down and dirty for their boyfriend's viewing pleasure yet again. The naked babes each waited on one side of the mud pit, facing each other, ready to dive in. They sultrily grinned at each other, before Akeno held three fingers in the air, then two and finally one before the busty beauties both dived into the mud at the same time, splashing it all over the place. The mud was so viscous and deep, that it took them a few seconds to reemerge from it, flipping their drenched hair as they surfaced. They giggled like the slutty schoolgirls they were as they approached each other, struggling to move through the thick substance. It was like trying to swim through mashed potatoes.
Finally, the sex rivals made contact and tried to grapple each other. Akeno grabbed Rias by her thin hips and tried to supplex her into the mud while Rias assaulted Akeno's breasts, pinching her mud covered nipples and bouncing them all around. From all the threesomes they had with Issei, Rias knew how much Akeno loved to have her tits get roughed up. Still, Akeno resisted and finished her supplex, dropping Rias into the mud, making her shriek. Rias surfaced and the girls kept giggling as the redhead tackled the raven, splashing the mud around even more. The girls moaned and grunted as they grappled, pulled hair, grabbed asses and tits and tried to hold their rival down for ten seconds like in actual wrestling.
Their hands in each other's mud caked hair, the girls pressed their flawless tiddies together and then their tongues. They slurped and sucked on each other's organs, as their hands came down to finger their rival's pussy while the other hand squeezed and scratched at the other girl's ass. They continued this for a bit until Rias wrapped her arms around Akeno, spun her around and dropped her into the mud, her knee on the raven's pussy as she held Akeno's leg in the air and held her there with her face in the mud for about four seconds before Akeno slipped away and dove towards Rias, smashing her basketball sized breasts into the redhead's face as she knocked her rival down, the mud splashing all around.
Akeno kneeled on Rias's back, holding her down for six seconds before her rival flipped her over onto her back. The girls gained a fierce look in their eyes as they got into a little splash fight. The mud was viscous enough for Akeno to grab two handfuls of it and spread it all over Rias's breasts, making her moan. Rias then grabbed a massive handful of mud and spanked Akeno, making her shriek as the redhead caked her flawless ass with the substance. Akeno then took another two handfuls of mud and smashed them into Rias's face, shampooing her hair with it. Rias did the same until both of them were soon covered head to toe in mud. They stopped for a second to look at each other and giggle before Akeno grabbed Rias and then dove backwards, bringing them both deeper into the mud.
They wrestled with everything they had, Rias grabbing Akeno's hair and pulling, massaging her opponent's pussy as the raven moaned. Akeno then wrapped both legs around Rias's head in a scissor lock and flipped them over, Rias countering by getting up and dropping Akeno into the mud with her legs still wrapped around her rival's head. Rias took advantage of this, holding Akeno by one leg as she tribbed her, rubbing their cunts together. Akeno got up before the ten second countdown could finish and they rubbed pussies until both girls orgasmed and they lustfully kissed each other. Rias smiled a devilish grin and dove into Akeno as they kissed, their breasts still mashing together. Akeno, still in a state of euphoria from her orgasm, did not have enough energy to fight back. Rias held her down for ten seconds, making her the winner of the mud wrestling match. The girls finally separated and tried to catch their breath. They looked at the mess they made of each other and laughed.
"Shower?" Rias asked.
"You know it, babe" Akeno answered.
The backyard had an outdoor shower, a huge one. Big enough for all of Issei's girlfriends to bathe in and have a lesbian orgy. There were two shower heads but Rias and Akeno decided to share one. They sighed with pleasure as the warm water poured down onto them and cleaned them of the mud. They fondled and pawed each other lustfully, shampooing the mud from each other's long, beautiful hair. They madeout for a few minutes before going into the jacuzzi to relax. They came together again, licking each other's mouths and tongues, their hands in their best friend's hair. As they loved each other passionately, Akeno broke their kiss and signaled for Rias to get up and and sit on the edge of the tub. Rias understood. Since she won their mud wrestling match, Akeno was going to reward her with cunnilingus.
Rias did as she was told, getting up and sitting on the edge, her soaked hair dripping with water. Akeno got into position and first decided to tease Rias by giving her pussy some light kissing. Riss cooed at the attention before she lost patience and used her legs to pull Akeno's face deeper in. The raven got the message and finally began lustfully licking her rival's pink entrance. Rias groaned out loud as Akeno slurped and licked at her cunt. Rolling her tongue and bobbing at her clit like an apple at a Halloween party. After two minutes of this, Rias could take no more and came, straight into Akeno's mouth, tongue, lips, face and hair. The exhausted Rias went back into the tub to embrace Akeno. They kissed and relaxed in each other's arms for a few minutes, enjoying themselves and resting their weary bones and erogenous zones but it didn't take them too long until they got their energy back and wanted to resume their contest. They both could tell by the look in each other's eyes, that the other slut wanted more. They knew each other so well.
"I'm up for a good, old-fashioned sexfight, how about you?" Akeno asked.
"Of course, baby." Rias answered. "I've got a matted room and about 20 or 30 bottles of baby oil with our names on it".
"You're on, bitch. Let's fuck!" Akeno declared