Yuji began thrusting his shaft into her again.
"Ahyah!? Aaahn!"
Suzune let out a sensual cry. She arched her back and clung to Yuji. He ignored it and continued to thrust, enjoying the pleasure she gave him while also observing her reactions. He was experimenting with different things to find her weak points, the spots that would stimulate her even more.
"Ah, ah, ah, ah, aaaaaahn!"
He tried a rear-entry position. She seemed to prefer it when his shaft thrust into the deepest part of her uterus. The more she was intoxicated with pleasure, the higher her voice became.
Yuji also enjoyed the pleasant sensation of his hips hitting Suzune's soft buttocks with every thrust.
"Oh! Auu, ahahaa!"
Just a short while ago she was a virgin, but now, intoxicated with pleasure, she was letting out animal-like cries—a good sign. She was well worth the effort of nurturing.
"Aaaahn!"
Suzune's body went rigid. Yuji held her back down and continued to thrust the tip of his shaft to the back of her vagina as he ejaculated.
"Auu, hahee..."
Suzune's body went limp and rigid. She occasionally twitched. She was conscious, but her eyes were unfocused and she wasn't moving. Her white, well-formed mounds rose and fell with her breathing.
"Hee..."
When Yuji pulled out, Suzune shivered and let out a small cry. Her voice was intoxicated with pleasure and sounded very sensual.
It was almost 8 p.m. when Yuji dropped her off near her dorm. She later reported that she wasn't disciplined for breaking curfew. Even when she passed the security guard or ran into the manager, they simply greeted her.
"So the 'Night Crawl Pass' has a use for monsters," he thought.
He decided to let Suzune keep it for a while since she lived in a dorm. He checked the app, and her affection level had reached 36, so he changed her status to "Friendly."
---------
It was the third day since he met Suzune. Her affection level had reached 51, so he had changed her status to "Affectionate."
"You're here early today. Did you miss me that much?"
"D-don't be stupid! Let's just get this over with!"
Suzune spoke with a fierce expression, but the embarrassment on her face made it obvious that she was just trying to hide her true feelings. In fact, Suzune was now more proactive in bed.
They had sex five times with kissing and embracing. Suzune no longer resisted kissing. She would actively entangle her tongue with his. She also no longer tried to hide her pleasure and would beg for a kiss.
Their play was becoming more intense by the day. Yuji was even beginning to enjoy the process of nurturing a virgin from scratch. After their fifth session, he asked Suzune for a blow job.
"Fine. I don't have much time, so just once," she said.
Suzune took Yuji's shaft into her mouth. It was a gentle blow job filled with emotion.
"Nng... reru... njuu..."
Since it was her first time, she was clumsy, but her sincerity came through.
"Nnn... nnn... nfufuu..."
"I'm about to come."
"Nnuju... it's fine, go ahead..."
Suzune's head bobbed up and down. Yuji ejaculated without hesitation, and at that moment, she removed her mouth and caught his semen with her hand. The timing was off, and some of it splattered on her face.
"Ah... hot..."
Now that he had reached level 10, he could use "Monster Enhancement." He planned to have sex with Yukina and Rinko tomorrow and the day after, so he would get to enjoy Suzune again in two days, but he was excited about the prospect of doing it raw.
---------
It's Saturday today. Suzune visits Yuji's house for the first time in two days. This week, he had dedicated his time to Suzune's education, so he hadn't spent much time with Yukina and Rinko. To make up for it, he provided two full days of "service" to them.
With the effect of the "Night Crawling Permit," she could likely stay out until morning, but being the diligent student she is, Suzune didn't do so on weekdays to avoid a significant impact on her studies.
According to what Suzune told him and information from "Love Hunter," the high school she attends has a unique system where students are divided into classes A through D and compete through a system called the "S System." In reality, the desired career paths are only available for Class A, and students enroll without fully understanding this system. Suzune is in Class D and is aiming for Class A for another reason.
But since today and tomorrow were holidays, she was going to stay at Yuji's house. It was, in a way, the first time a monster was having a sleepover.
Suzune arrived around 9:30 a.m., earlier than scheduled. This was because Yuji had messaged her to see if she could come a little sooner since it had been two days. Maybe because of that, she seemed a little happy. This was a huge difference from the negative aura she had when she was first brought here. Maybe she had been eagerly anticipating having sex with Yuji.
"I'm happy you accepted my request."
"Let's get it over with quickly."
She held a bag with her overnight preparations.
"You were in a hurry to do it, weren't you?"
"...!"
Suzune's face flushed bright red. Unable to lie, she couldn't immediately find words to cover up her true feelings.
Before the first round, he asked her for a blowjob. Suzune had been learning. After increasing her affection level even more, he planned to have Yukina or Rinko give her lessons on fellatio.
"Ngghh... n... ngh..."
With a change of heart, Suzune accepted his ejaculation in her mouth for the first time, but she didn't swallow it. She spat it out discreetly, as if being considerate of Yuji. After she rinsed her mouth, they began to make love in earnest.
"It seems you've really come to like sex, Suzune."
"...Whose fault do you think that is?"
"Haha, I bet your brother doesn't know this side of you."
"D-don't tell my brother!"
Suzune's face changed drastically as she clung to Yuji. Just as the data suggested, she was likely a 'bro-con.' One of the reasons she aimed to rise from Class D to Class A was to gain her brother's approval.
Yuji's mischievous side was stimulated, so he started with cunnilingus, driving Suzune into a frenzy. Afterward, they moved on to sex without a condom. The "Monster Enhancement" ability already provided contraception.
Suzune pulled down her panties, got on all fours, and offered up her butt. With a squishy, lewd sound, she exposed her own genitals. She writhed her hips, stimulating Yuji's lust. Yuji inserted his manhood.
"Do you want me to do you from behind?"
"...You can see for yourself, can't you?"
Suzune loved this position that allowed her to go wild like an animal in heat. She enjoyed going crazy like a female beast.
"Ah-hiiieee! Hi-giieee! Ngk-uuu!"
The sensation of the bare shaft for the first time, a stimulation beyond her imagination, made Suzune arch her back and her eyes widen. The direct heat on her muscle walls, without the barrier of a condom, and the friction caused her constricted pupils to tremble. Unconsciously, she opened her mouth like a female dog and let her tongue hang out.
Yuji, for his part, let out a low growl. His fully embedded shaft was entwined by countless folds, a pleasure so intense his hips felt like they were melting.
"Ah, as I thought, it feels so much better raw..."
Yuji exclaimed in admiration.
With Yukina and Rinko, the app's optimization function made their insides fit Yuji's shaft perfectly. Furthermore, thanks to Yuji's training and their own efforts, they had mastered various 'clamping' techniques that can be acquired through practice, such as the 'octopus pot' that sucks at the tip, the 'money pouch' that provides immense pleasure with each thrust, and the 'bale clamp' that does both.
But what Suzune possessed was a natural 'masterpiece' that couldn't be replicated by technique. The 'thousand earthworms' - her countless folds - clung to his shaft, squirming and wriggling. Without a condom to get in the way, it was a truly exquisite sensation, a sublime and ecstatic masterpiece.
"Ah-hyaaa! Aahn! Fuhiii! Hah!"
His piston-like thrusts grew faster, and the flared ridges of his shaft churned through the 'earthworm' folds. Her insides secreted a lubricant of pleasure, making the wriggling folds adhere even more tightly. As he fiercely dug into her vagina, Suzune's ecstasy intensified, and her breathing became ragged.
"N-hiii! This feels good! This... I like it! Hihh! Hiiinn!"
"What do you like?"
"A-hic! This... the willy... the willy! I-hiiiiii!"
Suzune kept moaning, uttering lewd words. When a beautiful girl like her says such indecent things, it's impossible not to get excited.
"Ha-hiii!? No! There! Aahn...!"
Suzune let out a loud cry, her back arching greatly.
Yuji took his hands off her soft buttocks and reached for her erect nipples. He pinched and rolled the now-hard nipples between his fingers.
"N-aaaahn! That's amazing! Aaaahn! My nipples! Ah-hic! Ah-hiiinn! Ah-hiiiiii!"
While teasing her sensitive nipples, he thrust fiercely into the depths of her vagina. Her nipples began to release milk. The combination of Yuji's caress and the stimulation of the milk release made Suzune go even more wildly out of control.
Suzune's mind was on the verge of collapse. The bed creaked as she shook her head, her long hair bouncing. The tightness of her vaginal canal was also increasing, and Yuji's feeling of impending climax was rising.
"N-hiii! Hii! Hiiiii! Aaaaaaah... I'm... coming... N-aaaaaaah!!"
It looked like Suzune would reach her climax before Yuji.
"Ah-hiiiiiiiiiin!"
Just as expected, Suzune's body surpassed its pleasure capacity and shot into climax.
"Aahn! N-hiii! Hiaaa! Aaaaaaah-aaaaaaah!"
============
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