Mitarai thought of developing the vaginal flesh around her womb, still unacquainted with any male. Thinking this, he ground his hips, rubbing his glans against the flesh near her cervix over and over. Each time, Rias reacted, her body already moving to seek pleasure from her very depths.
Her convulsions were not gentle twitches but intense, violent shudders that wracked her frame repeatedly. Despite Mitarai's unpracticed hip movements, Rias moaned as if striving for nothing less than pure ecstasy.
His glans, sizable as a child's fist, persistently tormented her cervical opening, thrusting against it as if trying to force its way in.
Mitarai, who until moments ago could only move his hips in a figure-eight pattern, finally began to piston into her. The sound of flesh slapping against flesh, the wet noise of mucous membranes rubbing together, releasing her love juices.
Even in the soundproofed room, Rias's screams echoed through the bedchamber.
There was a reason Rias had lost her composure and was gasping so. Just as Mitarai's sensations had heightened, so too had Rias become more sensitive to the stimuli he provided.
The devil's contract, binding them through their very souls. To sell one's soul to a devil meant exactly this: an effect that heightened their sensitivity to ensure they would never forget one another.
Once this was known, they would become unable to part, and no force in the world could sever their contract now.
Gripping the narrow curve of Rias's slender waist, he used it as a handle for his vigorous thrusting. He would pull back until the tip of his glans was on the very brink of slipping out, then use the momentum of the withdrawal to slam his hips down in one powerful motion.
His cock would plunge all the way to her cervix, which had just begun to crave pleasure, in a single stroke. An impact, forceful enough to seem audible, assaulted Rias, stealing her breath.
Because he was not only long but also thick, he was stimulating places her fingers or any toy had never been able to reach, causing sounds she couldn't voice to leak from her lips.
"Your voice, Senpai, is incredibly lewd. Just hearing it gets me hard."
"Ahhn don't say that I can't believe the sounds I'm making either~!! Ahh, but it's all your fault. It's because your cock is so big and thick that it's bad…"
Looking down at Rias, who was pinned beneath him, it even seemed like pink heart marks floated in her pupils. Her perfectly sculpted face was completely melted in pleasure, a world of difference from her usual demeanor.
The situation of the ever-composed Rias being driven mindless by his dick would be exciting for anyone. Tears spilled from her large eyes, leaving multiple tracks on her cheeks.
From the heat of her arousal and the exertion of sex, sweat beaded on her forehead, causing her hair to stick to her skin.
With every thrust of his hips, her voluptuous tits, large as soccer balls, bounced wildly. While it was a delightful sight to watch, he wondered if it hurt her.
Releasing his right hand from her waist, he grasped one boob firmly. Squish A soft, pliant sensation. Her skin was damp with sweat, clinging to his touch, yet these were the finest breasts, seemingly sucking onto his palm.
He lifted it from beneath, supporting the weight, and played with the jiggling flesh.
Rias watched with dazed eyes as her own breast was fondled. It was unclear what she was thinking, but as he played with her breast, the constriction within her pussy tightened, making the movement of his cock more difficult.
To be specific, more vaginal flesh seemed to cling to him, requiring significant effort to pull out.
"Guh... Senpai, I'm sorry. I, I'm already...!"
"It's fine!! Spurt it inside my pussy! Let me feel all the cum you've saved up until now right in my womb!"
Mitarai stopped fondling her breast and buried his face between them. The flesh-packed mounds were more comfortable than any pillow, and he could strongly smell her sweet scent.
Because of their difference in height, he thrust his hips frantically while his face remained buried in her cleavage.
He focused, clenching his anus, careful not to ejaculate prematurely. If he was going to come, he didn't want to be the only one reaching climax; he wanted Rias to come with him.
Takashi angled his hips, rubbing the head of his cock against a uniquely rough, raspy spot deep inside her cunt that was different from the rest of her vaginal walls. A much louder, sweeter moan escaped the beauty's lips.
Rias's brain was no longer functioning properly; operating on instinct, her body moved to receive the semen of the male pounding into her.
She adjusted her internal muscles, providing just the right amount of stimulation, ensuring he wouldn't climax unless he was pressed firmly against her womb.
Yet, without forgetting her own pleasure, she subtly shifted her posture, aligning a certain spot—a G-spot that was, in a way, brand new—to make contact with the head of his cock.
Externally, the clitoris, and internally, the G-spot, were the most sensitive points for a woman.
As Mitarai had guessed, Rias herself rarely touched herself there; her usual masturbation involved her clit or, to a lesser extent, her nipples. Even as a devil, she was somewhat afraid of touching deep inside her own pussy, and had instead always focused on the pleasant external areas.
Perhaps as a consequence of that, each time the head of his cock struck that spot, an indescribable, electric shock of pleasure shot through her. The sensation was so intense she felt she might disappear, needing to cling to something to remain grounded.
Just then, Mitarai, who was similarly buried in her breasts and thrusting wildly, came into her view. She wrapped her legs around his waist, pulling him deeper, and embraced his head tightly with her arms, pressing him harder into her chest.
She just barely managed to tether her soaring consciousness, preventing it from flying away completely.
But her relief was short-lived. Mitarai's thick cock also seemed to have been holding back its climax to its limit, as it had swelled even larger. The engorged glans pushed against her womb with wet, thick sounds Squish Squelsh, making sparks scatter before her eyes.
Each of the clinging inner folds seemed to suckle and assault his penis, demanding cum. With every up-and-down movement of Mitarai's hips, the folds rubbed and stimulated his member, urging him to ejaculate.
They exchanged no words. Only his eyes, peering from between her breasts, remained fixed on Rias's face. Rias, in turn, stared intently back into Mitarai's eyes, and like lovers, the two of them climbed together towards their peak.
The pleasure, which had been rising like a rollercoaster, was on the verge of exploding, ready to fall over the edge after just one more step, one final push.
The depths of her body grew hot, and her pussy, which had been contracting rhythmically, now clenched down powerfully, TIIIGHT, intensely massaging his cock.
"—I'm coming! I'm gonna come!"
"Me too! I'm— I'm going to cum too ah… nn—!"
Splurt Splurt…
Splurt!!! Spluuuuuuuurt!! Splllurt!!!
His cock tip pushed against her deepest point—her womb's entrance—as his semen flooded out of him in violent bursts. Sticky, indecent sounds echoed inside her as rope after rope of hot cum surged through his urethra and spilled straight into her uterus.
The heat was so overwhelming that he almost blacked out. His mind flickered white from the intensity, and he had to grit his teeth hard just to stay conscious.
Rias trembled wildly beneath him. Even for a devil's body, the feeling of thick, molten semen erupting directly into her untouched womb for the very first time was unbearable in the best way. Her legs locked around his hips, forcing him to stay deep inside as her orgasm crashed over her again.
Her womb spasmed every time a new burst of semen splashed against it—hot, then cooling, then hot again—each wave of temperature pushing her deeper into ecstatic madness.
From the tiny slit just above where they were joined, her urethra pulsed and released a clear, hot fluid that sprayed messily across Mitarai's abdomen. She should've felt embarrassed about dirtying him so lewdly, but her climax stole all sense of restraint; she surrendered to pleasure completely.
Her mind went pure white. For a moment, she felt consciousness leave her body entirely. That was how overwhelming the pleasure was—Mitarai had carved something monstrous and irresistible into her depths.
Her instincts as a woman knew it now, without a shred of doubt:
'Only this man could satisfy me~!!'
Her body arched, trembling uncontrollably as she rode out the last violent waves. For Mitarai—who until recently only knew eroticism from screens and magazines—seeing a real woman convulsing in climax beneath him, cumming in sync with his first ejaculation, ignited a possessiveness in him he never knew he carried.
The bedroom echoed only with their ragged breathing as they clung to each other—Rias wrapped around him, Mitarai holding her close—basking in the afterglow of a shared, shattering first climax.
"Nnn Sex with you is incredible… I've never felt anything like this before," Rias whispered, still breathless.
"I… I'm just happy I could make you feel good, Senpai. That was the best I've ever felt in my life."
"Heh… I'm glad. I already thought it last time we kissed, but our bodies are a perfect match. You've completely melted me… Once you teach a woman pleasure like this, she won't be able to settle for anything less."
She giggled mischievously.
"So if I said you'd have to take responsibility… what would you do?"
"S-Responsibility!? Uh—well… if it's Senpai, then… y-yes. I'll take responsibility. I promise."
"Mmh… good answer." She brushed her lips against his cheek.
"And let's keep this between us for now. No one needs to know yet. We can take our time… just the two of us."
Rias was a devil, and Mitarai was a human. She had more than enough time—and if it ever came to it, she wouldn't hesitate to make him a devil and her servant, binding him permanently to her world.
The thought alone made Rias smile with beautifully wicked delight.
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