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She obviously wasn't under the effect of any aphrodisiac curse, like Asia had been during their steamy bath time together. For her to reach climax even when he had only made his moves on her breasts, showed just how sensitive to pleasure her body truly was.

"Ah... W-What was that... Ah!~ ...Did I just... reach orgasm...?"

Hasegawa quickly understood what had transpired with her body and that very realization of her bodily circumstance was why she was even more surprised by this extremely bizarre outcome. While she only had bookish knowledge, and trivial facts she picked up from surfing the internet, she knew for sure that women were not supposed to reach climax so easily.

Meanwhile, Basara wanted to let her — who was now in a hazy trance due to her first-ever orgasm, paired with the confusion about her sensitive body — experience the ecstasy a woman could only receive from her butt being groped and played with. While continuing to suck her breasts and nipples, he grabbed her buttocks and began violently kneading them to his heart's content. 

The sensations he received from groping her massive, well-shaped, and toned bubble butt were otherworldly, and the reactions it evoked on her were also to his liking.

" !Wa-Wait... Tou...jou…kun… If you do that..!"

Hasegawa — who had already become extremely sensitive, on top of her already acutely sensitive body, due to already climaxing once — felt her waist begin trembling violently, a hot and scathing feeling of rising ecstasy spread through her lower abdomen all the way to the end of her feet and a liquid different from water began to seep out of her throbbing snatch. However, Basara wasn’t anywhere near done yet.

He left his right arm wrapped tightly around her waist while bringing up his other arm to make contact with the tip, to clean away the foam but it seemed that Hasegawa managed to get a little bit of her sanity.

"Aah!~ ...W-Wait~, Toujou-kun~ ...Ah!~ I-I still want to help wash you...r bodyyy~"

Abruptly, she kicked away the plastic sitting stool and pushed Basara towards the floor, planting him there while she remained upright.

‘She is surprisingly strong.’

While Basara hadn’t tried to fight back, he was surprised how those dainty hands — that seemed so soft and thin, seemingly without any form of strength — had managed to push him down so easily.

Once Basara was laid flat against the cold and damp floor, Hasegawa inched her foam-covered body closer towards him.

"Be a good boy and don't move... I'll also use my breasts to help you clean this place..."

Hasegawa said, in a sultry coquettish tone, while giving an alluring seductive smile that wouldn’t lose out to that of a trained succubus, in the next moment, she applied some pressure with her body. 

She began using her large and full breasts to thoroughly rub against the top of his body.

Compared to before, when she used her breasts to wash his back, the movements of her milk jugs could now be felt even more clearly.

".......!"

Basara minutely quivered at the sensations. Hasegawa's soft breasts moved about provocatively on his muscular chest; with every movement, the foam on her lustful breasts would create obscene sounds that would play with his lust-driven mind.

Soon, she moved lower and lower until finally, she reached the edge of the towel wrapped around his waist. However, the particular part of his body that was already standing up due to a psychological reaction —

"This is the first time I've seen a live one."

Hasegawa was many things but she wasn’t a naive woman. Furthermore, as someone who was trained as a doctor, she had a deep knowledge of human anatomy and had experience inspecting dead bodies during her medical studies. Due to that, it wasn’t her first time seeing a male sexual organ.

Still, there was a tiny problem.

‘Is it supposed to be this big?’

Hasegawa simply decided to chalk it up to his mysterious ancestry and began to focus on the task ahead. 

“Hasegawa-sensei?”

“There’s something I always wanted to try after reading a book that belonged to one of the students that liked to ask advice from me.”

Hasegawa let out a wry smile and unscrewed the head of a body wash, pouring its contents onto her breasts; the high viscosity liquid smoothly covered her foamy breasts, and a small pool formed at the center of her deep cleavage. 

Moments afterward, she knelt in front of Basara and spoke to him in a tone oozing decadence and lust.

"Come, Toujou-kun... You have to learn how blissful it is having an older sister's love."

Those lovely words instantly captivated Basara's mind, robbing him of the capacity to make any movements.

‘Hah…’

"The joke made in the infirmary is about to come into fruition."

Hasegawa chuckled lightly at his sarcastic words, then supported her soap-covered breasts from below with her arms, and began to slowly advance inwards under the towel around his waist.

Hasegawa's breasts brushed Toujou Basara's body part under the towel and surrounded his throbbing hard flesh.

"Uh~?" 

Just like that, Hasegawa propped up the towel with her massive breasts alone and began moving her upper body up and down, robbing Basara of any capacity to think. He could only sigh and let her do her depraved magic on him.

Last night Lucia had serviced him in the same way but the simple fact of the matter was that the two were simply incomparable to each other. 

Lucia was unmatched as a prime Succubus but seeing a glamorous woman such as Hasegawa surrounding his rock-hard penis with her large and criminally soft breasts brought him a different kind of pleasure that was hard to explain; it could only be experienced and relished not talked about.

The giant breasts defied gravity to stick straight out towards his throbbing shaft, settling in a round enamoring shape, and the cherry-colored tips were already hard and erect as if hoping to draw his eyes toward them.

“Ohh~!”

The smooth, unbelievably soft, and springy texture of her shapely breasts surrounded his heated shaft, making it pulsate in anticipation. The warm and firm titty pressure was so pleasant that he could not help but moan out loud, losing any semblance of self-control he had been trying to put on.

“I am doing it right?”

All Basara could give as an answer was a groan of debauched pleasure, making Hasegawa smile in a lustful ha e. She was happy that she could bring such pleasure to Basara.

But it wasn’t enough for her. She wanted to give him even more.

‘Should I try doing that?’

Thinking about the next step in that book, she used a bit of the water from the bath and wiped away the foam from her breast and his penis, preparing it thoroughly for what was to come.

Then, after breathing deeply, she took the engorged head of his penis into her mouth. Her warm tongue wrapped around the tip of his dick, and instantaneously a deep shock ran through his body.

“Ugh.”

Her plump pinkish lips gently stroked the hard shaft and she intensely sucked at the sensitive head while the tip of her tongue slowly, sensually, crawled from the base to the head as if licking off the precum flowing from the tip and an obscenely wet sound rang throughout the room as it mixed with the saliva in her mouth.

From the tip of his penis, a slightly sour liquid began to ooze. But Hasegawa did not mind the taste and if she had to be honest, quite liked it instead.

For Basara, he felt like he was in heaven. 

In addition to the soft sensation reaching his flesh rod, the visuals of the white breasts enveloping his penis aroused him to no end. Even though in terms of skills she was clearly inferior to Lucia, he still felt a great amount of pleasure.

After being brought to the brink earlier, he reached that point again before long.

“I’m about to cum…”

Basara quietly warned of his impending release. He was already at his limit and had to give his all to not simply grab Hasegawa's head and rough her up.

Hasegawa answered Basara’s words with a bewitching smile and wrapped her lips around the head of his penis as it poked out from between her breasts before continuing her movements.

Basara understood that she was wordlessly telling him to cum inside her mouth. This understanding was the last straw and with a deep groan, Basara released his seeds in Hasegawa’s mouth.

Hasegawa tried gulping down everything but this ultimately proved to be too much for her. Taking the still pulsating penis out of her mouth, she closed her eyes as she felt herself being covered by his white-hot liquid.

Looking down at the sexy woman whose face and hair were completely soaked by his overflowing sperm, Basara felt heat rush down again toward his nether part.

After swallowing the remaining spunk in her mouth, Hasegawa gave a coy smile as she asked, 

“Shall we go for another round?”

The answer was self-evident.

Like this, the two of them kept bringing the other one to the extreme heights of pleasure many times over.

In the end, while they never crossed the final line, there wasn’t a part of Hasegawa that wasn’t covered in cum.

This was truly a night neither of them would either forget.

(AN: I honestly hesitated between making this their first sex or not but then I decided against it. Those who know Shinmai know Hasegawa's true identity and if it’s too soon, it would mess up my plans for his power growth.)