The sun was bright, shining on the sea and emitting a shimmering glow.
The girls were showing off their beautiful figures and their youthful, radiant energy.
Stepping into the water, the slightly cool sensation was invigorating.
"How refreshing."
Rias lightly kicked up a splash, letting the water spray onto her body.
Water droplets trailed down from her chest, adding a touch of seduction to her appearance.
"Indeed."
The Rias of this world also sighed in admiration. Then, her eyes darted around, and with a mischievous grin, she scooped up some water and splashed it directly into Rias's face.
"It's even cooler this way."
The Rias of this world said giggling.
"Then you should cool down too!"
Rias responded to her enthusiasm, scooping up water and splashing it back at the Rias of this world.
Happily playing with the splashes, both of them wore joyful expressions.
"Sona-chan is here too."
Rias glanced at Sona and spoke up intentionally.
Exchanging a look with the Rias of this world, the two of them immediately understood each other's intentions.
They scooped up water and gave Sona a little 'cooling down' as well.
"Your thoughts really are in sync."
Sona was splashed with seawater, and her glasses became wet, forcing her to take them off.
"We are the same person, after all."
The Rias of this world looked at Rias and then smiled. "We are probably the closest people in the world."
"That really is enviable."
Sona also gave a small smile.
Though she said that, Sona showed a nostalgic expression, looking a bit shy.
She wasn't actually that envious, because she also had someone very, very close to her.
That was her older sister.
She had been a little tag-along since childhood, but as she grew up and developed a sense of shame, she became embarrassed by the unreliable Serafall's strange antics, which is why she would often show a look of rejection.
In reality, it was just a facade.
As for Rias, although she was very close to her own brother, Sirzechs was also a siscon.
However, he was the 'true older brother' type, not the kind of siscon from certain anime.
Sirzechs was busy as the Head of the Devil Kings, and since they were of different genders, Rias's relationship with Sirzechs was good, but it wasn't as inseparable as the bond between the sisters Sona and Serafall.
The three of them played in the water for a while, then the Rias of this world spoke up. "Want to have a swimming race?"
"How should we race?"
Sona became interested.
"Without using any demonic power, purely using physical strength to reach those reefs over there."
The Rias of this world pointed to the distant reefs.
Being Devils, they could see them very clearly.
"Are you sure you want to race someone from the Sitri Family in swimming?"
Sona said with a faint smile.
The Sitri Family's attribute is water; like Leviathan, they have an extremely high capacity for manipulating water.
Even without using demonic power, she still possessed a significant advantage.
"Hmph, I'm not underestimating you."
The Rias of this world hummed with pride.
At this moment, Sona also recalled the training the two of them had done recently. According to Rias, she had already reached the level of a Ultimate-class Devil.
This made her want to seek out Crimson for special training as well.
As it stood, being the weakest of the three in terms of power, the outcome really was hard to predict.
After all, a Ultimate-class Devil was already equivalent to the limit for a Non-royal Devil.
Those who could surpass this limit were all without exception natural geniuses.
"I see... even so, I won't lose."
A spark of rivalry flashed between Sona and the Rias of this world.
At this time, Rias remembered that the Rias of this world and Sona Sitri were both partners and rivals.
Their original strengths were about equal, but Rias's demonic power trait was Destruction, which gave her more of an advantage than water.
In comparison, Sona was calmer and better suited for techniques and strategy.
"Then get ready."
Rias waved her hand, making the two of them take the race seriously.
Then, with Rias counting down 'three, two, one', the three of them began swimming simultaneously.
The Rias of this world and Sona Sitri had very standard forms, but they were only'standard'.
Rias, however, was like a true fish, wandering freely through the water.
From time to time, she would circle around the Rias of this world and Sona, demonstrating her prowess.
"The damage is low, but the insult is high."
The Rias of this world complained, and then her butt was patted once.
Blushing slightly, the Rias of this world's mind began to wander, her breathing broke rhythm, and her speed inevitably slowed down.
"Good chance."
Sona Sitri's eyes lit up, and she surged ahead.
Rias thought for a moment and sat directly on the back of the Rias of this world, then gave her bikini bottom a tug.
Suddenly, the sensation of it digging into her flesh made her shiver. Strength surged from nowhere, and even with Rias sitting on her back, her swimming speed actually increased.
A beautiful girl sitting on the back of another beautiful girl who looked exactly like her, swimming forward frantically—this scene was truly something that left one speechless.
"Crimson!!"
The Rias of this world finally reacted, shouting as she flipped over and pinned Rias down.
As a result, the two of them fell into the water, and the Rias of this world's lips were pressed tightly against Rias's.
With Rias taking the lead in swimming forward, their bodies entangled in the water, the two mermaids swam toward the finish line.
Sona soon reached the end. Taking a slight breath, she saw the two Rias emerging from the water's surface, embracing each other.
"Strange, I clearly won, but I feel like I lost."
Sona blinked, finding this feeling somewhat inexplicable.
She hadn't seen the movements of Rias and the Rias of this world; she only saw the two of them emerging from the water in an embrace. That beautiful scene of them as one made her feel a strange emotion.
She really was a bit envious of this feeling... but if she had to spend time with another version of herself, it would probably be very awkward.
Sona thought.
"By the way, Crimson's swimming skills are really good. It's like you're a creature of the water."
As if to change the subject, Sona said.
"Swimming, huh... I have practiced."
Rias said with a smile playing on her lips.
"Including what you practiced doing earlier?"
The Rias of this world suddenly interjected.
"Well..."
Rias shrugged, leaving the Rias of this world with no choice but to facepalm.
In her heart, she couldn't tell if she was jealous or angry; it was somewhere in between.
One could only say she was slightly dissatisfied.
After all, she was a Devil, and she had already accepted the fact that her lover had more than one partner.
It couldn't be helped; who told Rias to suddenly appear and make her fall in love with her?
Since she was another version of herself, the position of the Main Wife was undoubtedly hers!
The Rias of this world was very confident.
They continued playing for a while, then the girls returned to the beach to play volleyball.
When they got tired of playing, they ate some watermelon, making the whole summer day feel refreshing.
Finally, when night fell, they had a sumptuous dinner, and the girls all returned to their rooms.
And the two Rias continued what they hadn't finished during the day.
Until the next day, Rias woke up early, and looking at the sea before her, she suddenly remembered something.
The Ingvild Leviathan of this world was still in a deep sleep.
She should take this time to wake her up.
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