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"So Rias, why have you called me here today?"

"I have something very important to discuss with you, Akeno."

At Kuoh Academy devils walked alongside humans in secret, and two of them were meeting right now. Rias, the president of the Occult Research Club and one of the most beautiful girls in school, and Akeno, the vice president of the Occult Research Club and one of the most beautiful girls in school, were sitting together in the club room in silence. None of the other club member were there with them that day, leaving just the two of them to discuss certain matters privately.

"Oh my Rias, this just isn't like you," Akeno said. "Whatsoever could you be concerned about?"

"You know what this is about," Rias said. "You remember how you were touching Issei the other day!"

"You're talking about when we went to the pool together a few days ago? I don't remember doing anything unusual."

"You had your hand on Issei's crotch for thirty minutes straight!"

"Don't be so uptight, he seemed to be enjoying himself back there. What's the issue?"

Rias's eye twitched, the lady struggling to keep herself from getting angry.

"You certainly realize that as King I get first hands on Issei right?" There was a hint of aggression in Rias's voice. "So I'd appreciate it if you weren't so touchy feely with my pawn."

"The King isn't anything of note without the Queen that protects it." Akeno seemed to be holding her smile back from becoming a smirk. "You should allow me to indulge myself every once in a while."

"Not when it involves touching MY Issei!"

"Yet I'd say he certainly prefers me!"

Rias calmed her down. Akeno was incredibly good at pushing her buttons, especially when it came to Issei, but she shouldn't let something like that phase her.

"There is one other reason I called for you today Akeno," Rias said, doing her best to remain professional.

"Oh?" Akeno's intrigue was piqued. "What is it?"

"This is admittedly a bit selfish of me, but I want to compare the size of our breasts."

"Really? I never thought you interested in that sort of thing."

"Remember when you were comparing our breasts with each other last time we went to the hot springs? You said your boobs were slightly bigger than mine, but if think I've grown bigger since then."

Akeno couldn't help but smile. This was clearly about Issei, they both knew how much he liked big breasts.
"I don't know Rias, my breasts still seem bigger to me."

"That's why we need to compare. We need to see which pair is truly bigger."

Before Akeno could even comment Rias pressed the lady's breasts against her own. They could feel the cloth covered nipples press against each other, the shock making Akeno jump up rather suddenly.

"Okay, calm down," Akeno said. "We can't get an accurate comparison with our clothes in the way after all. Never seen you so interested in this sort of thing before, something happen?"

"No..." Rias eyed the book on her desk, hoping Akeno didn't see it. "I just thought it'd be nice to finally confirm some things."

Akeno seemed to accept that answer, and the two began taking their clothes off. The doors were locked and the windows were shut, so there was no chance that someone like Issei would catch a glimpse. Their shirts and bras were strewn about on the ground, allowing such large chests to lay freely in the wind. They took off the rest of their clothes soon after, leaving them as naked as the day they were born.

"So if we line up our nipples like this," Akeno slowly pressed their nipples against each other, this time making Rias jump up. "I still think my breasts are just a little bit bigger?"

"Are you sure?" Rias pressed her chest harder into Akeno's. "Mine look bigger from my end."

"No, I have to say I'm a bit bigger."

"No, that's not what it looks like to me."

The two found themselves arguing as they pressed their breasts into each other, pushing and shoving their large boobs right into each other. Their nipples were pressed incredibly hard into each other, crushing each other under their incredible weights. Rias winced, feeling an intense amount of pleasure flow into her, but that wasn't what she was there to do.

She silently chanted a few magic words and dark magic sparked around in her hands. Without Akeno noticing some magic power went out from the four breasts. Akeno's breasts shrunk a bit, while Rias's grew in equal measure. She only let this continue on for a small bit before stopping, not wanting to steal too much from her friend.

Akeno found the spellbook in her home one day, blushing with embarrassment as she read it. It only contained spells meant to increase the size of one's bust, but all of the spells required absorbing mass from the breasts of others. Originally Rias wanted to completely disregard this book, but as she thought about Issei she always found herself drawn to it. Issei loved big breasts after all, maybe he'd appreciate her getting at least a bit bigger.

So that's what led to this current situation, with Rias now taking a bit of Akeno's breasts. She mentally apologized to her friend, making sure not to take enough to be noticed.

"Are you sure you're bigger?" Rias now felt more confident about the answer. "Because from here it looks like I'm bigger."

"You must be looking at it wrong," Akeno said. "Because it's clear to me that I'm bigger."

Rias initially wanted to scoff at what Akeno said, but then she looked down. Their breasts were the same size, no, Akeno was slightly bigger. Did she imagine using the spell? Did she mess up and reverse it by accident? Whatever the case was, she had to try using the spell again.

"See, I'm bigger." After doing the spell once more, Rias went to confirm the fruits of her labor to Akeno.

"No no, I'm bigger." Like she didn't do anything at all, Akeno's chest seemed bigger than Rias's once more.

"I'm bigger." Rias inflated her chest even more.

"I'm bigger." But once again, Akeno's chest was bigger.

Rias couldn't believe her eyes as she continued to use her spell. One moment she'd be increasing the size of her tits and seeing Akeno's tits shrink, the next she'd be seeing the reverse happen instead. Rias felt like she was going crazy, at this point she didn't care about only taking a discreet amount. She wanted to make her tits as big as possible as much as possible, to prevent that hard work from getting taken back.

As she continued with her magic something odd began to happen. The matter of their breasts was quickly moved back and forth, unable to stay within one vessel for long. Connections started to form between the breasts, allowing the flesh to be contained in both at once. The flesh between them was beginning to fuse, Rias's left breast merging into Akeno's right, and Akeno's left breast merging into Rias's right.

"I'm bigger, look... huh?"

"I'm much bigger... oh?"

The two looked down at their breasts, and instead of four large tits smashing into each other there were two large breasts shared between them. Despite there not being a single nipple in sight it somehow still felt like their nipples were pressing into each other, maybe even harder this time.

The two of them were only able to look down at their breasts in shock, unable to figure out what to say.

"But... how?" Rias just looked at the breasts in disbelief. "This wasn't supposed to happen."

"It's just like the book said," Akeno said, speaking to herself. "But I thought the book said my target had to use the spell at the same time to cause this."

"Wait..." Rias's eyes widened in shock. "You were using the breast stealing spell too!? You were stealing my boobs!?"

"It was just a little bit," Akeno said defensively. "You know how much Issei likes breasts! Besides, what did you mean by 'too'? Did you also use the spell!?"

"That shouldn't matter! You were trying to absorb my breasts just now!"

"Well you were doing it too! And thanks to you look at us!"

The two were pulling and tugging on their shared chest, hoping they could somehow separate. The two breasts that connected them stretched momentarily, but not a tear of rip seemed to appear in them. The shared chest didn't seem a hint close to separating, the fusion looking like it could be permanent.

"You tried to steal my breasts from me!" An inner rage welled up from within Rias. "I'll rip these right off you!"

"You have no right to say that after doing the same!" A fiery rage erupted within Akeno. "I'll rip these breasts off you!"

The two stepped back and pulled, desperately attempting to rip the breasts off of each other. They tugged and tugged and pulled and pulled, yet not a thing seemed to change on them. Despite the two pulling as hard as they could, they felt like their nipples were jabbing harder into each other. It was counterintuitive, was this a phantom sensation? Whatever it was, it made the two feel oddly aroused from what should've pained them.

Akeno stumbled back, falling onto her back and pulling Rias on top of her. The shared pair of breasts were crushed on both sides, and Rias's pussy fell atop Akeno's. The sensation jolted the both of them, a pleasure the two had difficulty describing.

Rias tried to keep Akeno pinned down as she pulled, placing her hands on her opponent's shoulders and slamming their pussies harder into each other. That didn't last long before Akeno flipped them over, being the one to dominate Rias instead. The two rolled around on the ground, desperate to be the one to dominate. They pulled and tugged, their pussies ground into each other the entire time, arousal growing far too much to contain.

With one last tug they came, burst into an incredible orgasm. The pleasure washed over them both, seemingly doubled now that the two were together. They shook and shivered, feeling like they would melt from the arousal as it washed over them.

"You..."

"You..."

The two refused to speak to each other for a bit after that, sitting on the ground and turning away from each other in anger. Their pussies were still locked with each other, probably not going to move for a while.