"Phew... As expected, a hot spring is relaxing. How about you, Takashi? Does it feel good?"
"It's supposed to be from a natural source, right? As a Japanese guy, that alone makes me happy."
The two had come to a secluded inn deep in the mountains. It was a place known only to those in the know; despite the few guests, the demeanor of the staff and their attentiveness to customers left impressions in every detail.
Since Rias had reserved a mixed-gender bath, they were soaking in it shortly after arriving at the inn.
However,
"It's true what they say about big boobs floating, huh."
"My, having large ones is quite troublesome, you know? They make my shoulders stiff, and men I'm not interested in stare. Fufu, but if it's you, Takashi, you can look all you want. My body and my heart, everything belongs to you."
An alluring smile that captivated men.
A faintly lewd scent teased the nostrils.
As if invited, his hand reached for her breasts. Trying to confirm their weight, he lifted them with his palm, feeling their heavy, substantial heft.
Rias's breasts, which continued to grow even now, had apparently recently reached the dream for men, the 110cm range.
Kneading these plump breasts, far beyond those of an average high school girl, allowed him to bask in a sense of masculine superiority.
The breast flesh that once only Issei Hyoudou was permitted to touch was now reserved solely for Takashi Mitarai.
With each squeeze that sank his palms deeper, Rias let out sweet sighs, spurring him on to continue.
The breast flesh peeked out from between his fingers with a soft squelch. As they were kneaded, perhaps she became aroused, her nipples hardening into stiff peaks.
"Mmhn... Y-you're kneading them too lewdly. I'm happy you're so engrossed, but... this is rock hard too. While you fondle my breasts, let's make you feel good too, Takashi."
Her slender, white fingers coiled around his penis.
The shaft, already stiff and rising, twitched in response to her grip.
Her fingers formed a ring that skillfully made contact with the sensitive glans corona, moving up and down rhythmically. Toying with her breasts and stroking his penis caused the hot spring water to splash and ripple.
The time they had reserved was a full hour; they could still enjoy their time together for a while.
If he pinched her hard, stiff nipple, Rias would cry out. If she roughly stroked the flesh of his glans corona, Mitarai would let out a low groan.
As if drawn together, their lips met, and they began a deep, adult kiss.
"Mmm... nnh... ngh... ... mmm... ngh... slurp... "
Their tongues moved like serpents, intertwining and seizing each other. Rubbing together amidst the saliva, their minds gradually tinted with a rosy hue.
Forgetting they were in the middle of a hot spring bath, they became engrossed in sucking each other's lips and rubbing each other's pleasurable spots.
"Rias... I... mm..."
"Yes. Together with me... mm!!"
With eyes open, gazing into each other's, only their tongues and hands moved.
Bubblesh!! Splattershhh!!
Thinking it might be a waste to ejaculate in the hot spring water, Rias lifted Mitarai's hips and took his trembling, sensitive cock into her mouth with a pop.
The white, masculine desire slammed against the back of her throat, as hot as the spring water, sticky and bitter. As his semen struck her throat, Rias's body trembled and jerked.
She, too, had reached her peak, her pussy, exposed between her legs in the water, twitching spasmodically.
"More... suck it more..."
"Shluuuuuuuuuuup~!!!"
Holding the glans in her mouth, she hollowed her cheeks, making obscene sounds as she slurped up his cum.
Surrendering to the sensation of semen surging through his urethra, he watched Rias's lewd, blowjob-driven expression. It was the face of a female, fawning and submissive to a male, utterly unbefitting of the "Onee-sama" of the academy. Her expression was utterly wanton.
Her eyes alone were fixed firmly on his penis, her tongue moving sloppily inside her mouth, coaxing out his ejaculation.
"Shluuuuuup... nnh... ngh... slurp... licking..."
Not a single drop of semen was spilled; it all passed through her esophagus and descended into her stomach. Perhaps because it was semi-solid, one could almost hear the plop-plop sound of it landing in her stomach.
Thinking that the hundreds of millions of sperm would become Rias's blood and flesh made his penis feel like it was regaining its hardness, even immediately after ejaculation.
"Shluuuuuup... pop ah. I drank it all. Even though it's supposed to be bitter, it tastes so familiar now... Oh my, it's getting hard again. I'd love to join together like this, but we'd lose track of time, so shall we continue in the room?"
Mitarai nodded at her words, and suppressing the ache in his lower body, they quickly washed themselves and silently returned to their room.
…
Rias Gremory's skin, fresh from the hot spring, was faintly flushed, and her body temperature, raised by the water, felt pleasant to the touch.
They both tumbled onto the futon that had been laid out while they were fooling around in the mixed bath. Rias below, Mitarai above.
Exchanging glances without a word, they shared a kiss.
"Mm... mwah... ngh... mwah..."
A sweet, gentle bird-kiss, just touching lips. The breath from their noses against their faces was ticklish, but she probably felt the same.
They continued kissing like that for a while, heightening their arousal. Underneath his yukata, his penis was rock hard, so stiff and taut it was almost painful, unbelievable considering he had ejaculated just thirty minutes ago.
He ground it against her stomach through the fabric of their yukatas, silently telling her womb, "I'm going in here now," as he usually would, but this time was different.
They had agreed beforehand that he wouldn't enter her vagina, but the hole behind it, her anus.
Rias had often thought about something.
She didn't mind arranging women for Mitarai. The more women gathered around him, the more people there would be to protect him.
While it couldn't be helped that Venelana and Grayfia had husbands and children, a small part of her wished she could be his first.
What she thought of then was anal sex.
Rias's ex-boyfriend, Issei Hyoudou, was a man with an extraordinary passion for breasts, but he hadn't shown much interest in the female genitalia.
The anal opening, toyed with and loosened by Mitarai's fingers, would probably be able to take a penis now. All of this was for today, this moment.
"Could go in missionary like this, but I want to see your big ass, Rias. Is doggy style okay?"
"Of course. Everything of mine belongs to you, Takashi. Come in whichever way you desire."
She rolled onto her stomach, her lush, full breasts squishing distortedly between her body and the futon. Her large, firm buttocks swayed from side to side invitingly, as if beckoning Mitarai.
He grabbed her Asscheeks firmly, spreading the cheeks, and stared intently at her anal opening, which trembled in anticipation.
The anal hole, developed by fingers and a vibrator, repeatedly opened and closed, revealing glimpses of its bright pink mucous membrane.
The lewd, untouched hole, tighter than her pussy, not designed for milking a cock…
...
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