He undid his belt and lowered his pants. The underwear he wore today was boxer briefs, which Rias also preferred. According to her, she liked how the shape of his penis was clearly outlined through them.
He could feel Akeno's heated gaze on his dick through the briefs. Staring at his crotch as if intoxicated by fever, she seemed less like an upper-class woman and more like a younger girl.
With a soft brrr sound, his cock sprang free from his briefs. Aroused by Akeno's lewd expression and her scent, his penis was already in full battle readiness.
The glans, the size of a child's fist, was swollen a deep red, and several thick veins bulged along the shaft. The coronal ridge was flared like an open umbrella, expertly shaped to pierce the flesh of a female like Rias.
Perhaps from recently being bathed in Rias's juices, the once bright red glans was beginning to darken to a reddish-black, as if slightly tanned. The base of the shaft was the thickest part, and the scent of male was strongest there.
His balls, which produced and stored the seed to impregnate females, were large, and inside them, his semen bubbled and seethed, demanding to be planted in the woman before him.
Akeno was overwhelmed by the penis before her. A meaty rod, so erect it could traumatize an average woman. It stood perfectly straight and rigid, as if it had a steel core.
And it wasn't just straight; it arched back so fiercely it seemed it might touch his stomach. What Akeno had seen online were average Japanese penises.
That's why she was left speechless by the foreign-sized cock before her. The pungent, concentrated scent of male. A scent that hadn't even been a hint when his pants were on.
A scent that, just from smelling it, made her heart race and made her want to submit to the male before her. As she simply stared, Mitarai swayed his meat, right and left.
Like a cat presented with a toy, she moved her whole face, tracking the swaying fuck meat. She stared, breathless, at the raw penis she was seeing for the first time.
Rias had said his penis was the best a male could offer. That even in a long devil's life, encountering another like his would be rare. Seeing it like this, she was certain that was true. It made her acutely aware that she was, after all, just a woman.
No matter how elegant, no matter how composed she usually was, faced with such a wicked cock, she would be reduced to just a woman—no, to a female.
The reason Rias had become more beautiful was surely because she had succumbed to being a female. Akeno was certain of it.
"Akeno, you've been staring at my cock this whole time. Do you like it that much?"
"Ha... yeees~!! Shown something... something like this, any woman would grow to like it. The scent is so strong too... I feel like I'm going crazy."
"Speaking of which, Akeno, do you know any sexual techniques besides actual sex?"
"E, eh? Well, only the knowledge I've gained from the internet."
"Hmmm, well then, I'll teach you the proper naughty things. When presented with a cock, it's basic manners for a woman to get completely naked first. Come on, don't just stare blankly, take your clothes off."
"E, eh!? Uu... I understand. If it's your instruction, Sensei. It is a student's duty to obey."
So, for all her being well-informed in theory, she actually lacked practical knowledge of sexual techniques.
In that case, implanting all sorts of knowledge into her would be just fine. Knowledge so vulgar she would never be able to look at another man.
First, she reached for her cardigan and slipped it off smoothly. Then, she pulled her white shirt up and off, revealing her black, mature lingerie that matched her hair color.
However, perhaps the size was wrong, or because of her breasts, it looked more like a micro-bikini. Through the gaps in her bra, her sizable, beautiful areolas, tinged with a slightly dusky hue, peeked out.
Her hands moved to her skirt, and as she slid it down, matching black panties came into view. The crotch of the panties was damp and sticky, likely moistened by the love juices her excitement had drawn forth.
Now clad only in her bra and panties, her face flushed crimson with shame, but the look in Mitarai's eyes clearly insisted that there was still more to remove.
Taking a deep breath and steeling her resolve, she discarded her bra and panties as well.
First, Mitarai's gaze fell upon the areolae and nipples that had been peeking from her bra. Perhaps it was a rule that large breasts came with large areolae; hers were magnificent.
Rias's areolae were a pretty pink, but Akeno's leaned towards a brownish hue. A being like Rias was the exception; brown areolae were generally more common.
Takashi wondered if this brown would darken further if she became pregnant. He briefly imagined her pregnant form but quickly stopped himself.
She seemed to be what one would call the owner of inverted nipples, their forms hidden within the soft flesh of her shamefully swaying breasts. His gaze slid steadily downward, taking in her slender waist, her smooth private part, and finally her vulva.
"Hmmm... So you have inverted nipples, Akeno. This is my first time seeing them."
"I-Is it strange? Because of these nipples, I've always been uncomfortable bathing with others, even other girls..."
"No, no, they're wonderful. Just as people's personalities are infinitely varied, so too are the shapes and types of nipples. In your case, it's simply that you have inverted nipples. So, don't be so self-conscious. In fact, you should puff out your chest with pride. You have such magnificent breasts…"
"By any measure, they're larger than your head, aren't they? They're a masterpiece packed to the brim with a man's dreams."
"I'm not sure if you're praising me or making fun of me... but, thank you. I feel a little more confident now."
Her breasts, which were larger than Rias's—or perhaps, considering Rias's recent growth, of an equivalent size—drew gazes regardless of gender.
From men, they would undoubtedly attract lustful looks, and from women, envious ones.
"Now, now that you're undressed, we continue with the etiquette. As I said before, it is a woman's courtesy to be fully naked before a cock. Do you know what comes next?"
"Umm... I'm sorry, I can't think of anything."
"Well, it's your first time, so it can't be helped. It's fine to lose yourself in sexual fantasies and masturbation, but for now, try thinking about how to please a man."
"…The correct answer is the dogeza prostration. You get on all fours and bow your head to the ground, filled with gratitude, thanking him for becoming erect for a woman like you. A woman is a man's possession; internalizing that is your job, Akeno~!!"
"…Well, not every woman is a possession. Only for those you truly wish to belong to. Being completely shameless would just make you disliked, after all. So, Akeno, do you wish to be mine? Do you not want to serve this cock?"
"Ahh... Yes."
As he swayed his cock, Akeno naturally moved into a seiza position on her knees and then bowed her head. She placed her hands on the floor in the formal three-fingered style and lowered her head towards the penis before her eyes, much like a traditional Japanese woman bowing to her betrothed.
Her flawless white back was on full display. Tiny beads of sweat, like pearls, dotted her skin, perhaps raised by a mix of excitement, nervousness, and shame.
The moment she performed the dogeza, something within Akeno shifted. In terms of S or M tendencies, Akeno's personality leaned towards the Sadistic side…