Even through his underwear, it was clear that it was much larger than Issei Hyoudou's. As she looked at it, a throbbing sensation surged within Rias's abdomen.
'Oh, fuck me~!!' Rias must've thought. How desperately she wanted that thing inside her cunt.
Although she hadn't touched it or even seen it directly yet, the masculine scent pierced her nose. The intense scent of masculinity intoxicated Rias's thoughts.
Her eyes became clouded, and she quickly put her hand on Mitarai's underwear, pulling it down in one swift motion.
Sproing!
His cock sprang out vigorously. Its thickness and size were in no way inferior to those of Western adult film stars. Added to that was the palpable heat radiating from it. This proof of superior masculinity captivated Rias. The glans, darkened to a reddish-black from excessive masturbation. The prominent, umbrella-like coronal ridge between the glans and the shaft, specialized for scraping away vaginal flesh.
The shaft itself was thick with several throbbing, pulsating blood vessels. Even the testicles beneath the shaft were large, perhaps the size of golf balls. The erection was overwhelmingly upward-curving, so much so that it seemed it might press against his own stomach.
For a normal girl, this would be terrifying, the stuff of lifelong trauma, but Rias found her gaze utterly stolen.
The devil race had long suffered from a low birth rate. While they managed by turning beings from other races into devils, it was only a matter of time before that wasn't enough.
Perhaps because of this, female devils were instinctively drawn to males exhibiting superior traits. Rias was no exception to this, finding herself irresistibly drawn to the massive manhood before her, despite already having a boyfriend.
"I-Is it really that big? I can't really tell myself."
"It's huge. Showing a girl something like this, any woman would fall for you. It's not just big, it's so hot. The scent is so potent, too... your cock is amazing. A perfect score."
"I-Is that so? It makes me happy to hear you praise it, Senpai."
The object of the entire student body's admiration was enthralled by his penis. A feeling of masculine superiority washed over him.
When he moved his dick left and right, Rias's gaze followed it, just like a cat following a teaser wand.
Under Rias's intense gaze, a small, transparent bubble of pre-cum, tinged with white, swelled from the tip of his glans. Puff! It inflated slightly before pop! bursting.
"...sniff sniff... Haa. It's really incredible... Oh, that's right. Since you showed me yours, I have to show you my naked body too…"
"Here, look. My breasts, they're big, right? I'm a woman too, so I'm sensitive to stares. I noticed you looking earlier, you know? Go on, you can touch them."
She took off her uniform top, revealing lingerie the same crimson red as her hair. With a snap, she unfastened her bra, and her breasts bounced freely with gravity.
Seeing real, live breasts for the first time in his conscious life, Takashi gulped audibly. Following Rias's guidance, he slowly reached out and touched them.
He lifted them from underneath, cupping their weight. The heavy, substantial feel of the soft flesh made him inadvertently let out a sound.
Seeing Mitarai's utterly virgin-like reaction, Rias giggled. Embarrassed, his face turned red, and he looked away, but his hands remained, holding her tits aloft.
The way the soft flesh quivered and shook was a first-time experience that had completely captured his heart. Utterly captivated, he continued to knead and shake them.
"Now, now, shaking them is fine, but don't you want to touch the tips? I've only just started dating Issei, so he hasn't touched me much there yet. Mmhfu, boys like this sort of thing, don't they? Is it about stealing a woman's 'first experience'? Or is it about carving your own masculinity into her?"
At the apex of her voluptuous breasts resided beautiful, pale pink nipples.
He'd often heard that large breasts usually had large areolas, but in her case, the nipples themselves were also large. They were big nipples that even a full-grown adult would find satisfying to suck on.
To put it crudely, they were like little nipple-penises. They certainly weren't child-sized, and for stirring desire and provoking lust, they were perfect.
The nipples, still unaccustomed to being sucked by a man, reacted to the air, twitching and contracting as if tempting Mitarai. Like a butterfly drawn to nectar, he brought his face closer to her nipple.
"My, is my nipple that interesting to you? Fine. You may touch it however you like. Touching is fine, kneading is fine, licking or sucking is fine too."
Having received permission, Mitarai took it into his mouth. The first thing he felt was a sweet, rosy scent. Had she showered with the rose-scented body soap provided in the room? She must have washed off her sweat before coming to see him.
Mingled with the scent of body soap was her own inherent, sweet-and-sour scent. It was reminiscent of oranges or lemons, perhaps. This citrus-like fragrance wafted over him, sending vibrations through his exposed dick.
Just as they looked, her nipples were easy to suck on. His entire mouth could envelop one. With each suck, the core seemed to harden slightly, becoming firmer, which only made it easier to suckle.
He was sucking so intently, like a reverted infant, when suddenly a hand gently stroked his head.
Startled, he looked up to see Rias looking down at him with a face full of affection.
"Uh, Senpai?"
"Be quiet and let me pet your head. I'll stroke your head while you suck on my breast. There, see?"
He did as she said and resumed sucking on her nipple. While holding onto the strange sensation of having his head stroked, as if by a mother, he continued to suck, using it to vent his sexual desires.
Mitarai licked the nipple nestled in his mouth. The firm, erect nipple didn't budge with just a light lick; he had to apply a bit more pressure to make it move.
But when he licked it with force, Rias's body quivered with a sharp biku'n. The knowledge that he was affecting this supreme woman so deeply satisfied his male instincts.
It was not just his tongue; when he used his front teeth to nibble gently—nibble nibble—her body would shudder and tremble for him.
Rias seemed to be even more sensitive to the gentle bites than to the licking, causing her to stop stroking his head and instead pull him tightly against her chest with a muffled "Mmmphhhh".
It should have been a motion to escape the overwhelming pleasure, yet it felt more like a demand for him to continue his sweet torment, ultimately subjecting her to even greater waves of ecstasy. Even so, she could not help but hold him closer.
Rias found herself objectively observing the fact that she was being brought to such heights by a younger boy, one with whom she had only just held her first proper conversation today.
She recalled the occasional talk of physical compatibility between partners. Perhaps this was what it felt like. Her own boyfriend, Issei Hyoudou, driven by his innate lust, tended towards selfish caresses. His goal was not necessarily to make her feel good, but rather his own satisfaction; if a woman was moaning, he considered himself fulfilled.
It might have been acceptable if his partner were a pure masochist, but unfortunately, true to her lineage of compassion, Rias far preferred caresses where both partners cared for and attended to each other's pleasure.
Though she had never tried it, she imagined the most mutually satisfying form of foreplay would be Sixty-Nine. Whether she was on top or her partner was, the idea of using fingers, mouths, and tongues to worship each other's most intimate places was intoxicating.
To receive stimulation while simultaneously giving it to the other. 'Ahh, what an ideal union between a man and a woman that would be.'
With a soft "Chu-pa", he released the nipple from his mouth, a transparent bridge of saliva naturally forming between his lips and the glistening peak.
The bridge snapped in the middle and collapsed, but the saliva-slicked nipple remained, shining enticingly. It stood taut and erect, possessing a unique combination of firmness and softness, and it quivered faintly.
"Mou~! You sucked on it so hard you're going to leave a mark. Fufufu, You went at it until it got like this… was it really that delicious?"
"Yes, Senpai's breasts were incredibly delicious."
"I see… Being told so directly is a little embarrassing. Now then, as thanks for making me feel so good, I should return the favor and make you feel good too…"
"That hard cock of yours has been pressing against my stomach this whole time, and I couldn't stop thinking about it. Hey, how would you like me to make you feel good?"
"...In that case, there is something I'd like you to do."