"Ahhh~"
A soft, high-pitched moan filled the Fun Dungeon.
Kurokawa was completely naked, on all fours on the padded bench. A black leather collar sat snug around her neck—the metal ring at the front connected to a short leash that Yamada held in one hand.
He tugged on it lightly, pulling her head back just enough to make her arch.
His other hand gripped her hip as he thrust deep into her ass. Thick and hard. He was already close.
Kurokawa's body trembled. Her short brown hair stuck to her sweaty forehead. Tears of pleasure gathered at the corners of her eyes.
"Yamada-kun… so deep…!"
He didn't answer with words. He just pulled the leash a little tighter and pushed in one final time.
He came hard inside her ass. Hot, thick ropes filling her up. His hips pressed flush against her soft cheeks as he emptied himself.
Kurokawa's mouth fell open in a long, broken moan. Her arms gave out, and she collapsed onto the bench, face pressed into the padding. Her body shook through the aftershocks.
Yamada stayed inside her for a few seconds, breathing steadily. Then he slowly pulled out. Cum immediately leaked from her stretched hole and ran down her thighs.
He released the leash.
Kurokawa stayed where she was, panting, looking completely wrecked and satisfied.
Yamada walked over to the small table in the corner and grabbed a towel. He cleaned himself first, then came back and gently wiped her down.
She turned her head to look at him, still breathing hard. "You… you're really getting addicted to using my ass, aren't you?"
Yamada smirked faintly.
"Maybe."
He tossed the towel aside and sat down on the edge of the bench, looking at her.
Kurokawa slowly pushed herself up to sit. The collar still hung around her neck. She touched it with one finger.
Yamada sat on the edge of the bench. Kurokawa slowly pushed herself up to sit beside him. The black collar still hung around her neck. Cum slowly leaked down her thighs.
She touched the collar with one finger, still breathing hard.
Yamada reached over to a small table and pulled out a plain black box. It wasn't big. He shook it once. Soft paper sounds came from inside.
"My maid helped me make it," he said. "It has all the names of the nurses. Not including yours, Tachibana's, or Mochizuki's."
He held the box out toward her.
"I need you to put your hand in and pull out a name. Whoever you draw is the one I invite next."
Kurokawa blinked. Then she laughed, still a little shaky from the orgasm.
"You're seriously making me choose who gets the next dungeon visit?"
Yamada nodded once.
"Yes."
She stared at the box for a second. Then a mischievous grin spread across her face.
"Okay… this is kind of fun."
She reached in without looking. Her fingers moved around the folded papers. After a few seconds she pulled one out.
She opened it slowly.
Her eyes widened a little.
"…Hiramatsu."
Yamada took the paper from her hand and looked at the name.
"Hiramatsu."
He folded it neatly and put it back in the box for later.
Kurokawa leaned against his shoulder, still naked and marked.
"She's the lazy one, right? Always complaining about overtime and falling asleep on the night shift."
"Yeah."
Kurokawa smirked.
"She's gonna freak out when she gets the letter."
Yamada stood up. He picked up her discarded uniform and handed it to her.
"Get dressed. I'll have Anri send the invitation today."
Kurokawa stood on slightly shaky legs and started putting her clothes back on. The collar stayed on for a moment longer before she finally unclipped it and placed it back on the table.
She looked at him one more time.
"You're really collecting all of us, aren't you?"
Yamada's crimson eyes met hers. Calm. Steady.
"One by one."
Kurokawa smiled, a mix of excitement and something softer.
"Well… I'm looking forward to watching her face when she walks in here for the first time."
She finished dressing and walked toward the stairs.
Yamada stayed behind for a moment, looking at the black box still sitting on the table.
Hiramatsu.
Next.
He picked up the box, closed the lid, and followed her up the stairs.
The dungeon lights dimmed behind him.
Yamada walked out of the basement.
Anri was already waiting in the hallway, tablet in hand. She looked at him with a calm, curious smile.
"Did you want to ask something?" he asked.
Anri tilted her head slightly.
"I've just been wondering, Master… how you plan on treating each of the girls. What is the criteria for how much pleasure versus pain they get?"
Yamada stopped walking. He looked at her for a moment.
"Depends on how they treated me in the hospital."
He started walking again, Anri falling into step beside him.
"Mochizuki was nice. She was clumsy and got yelled at by the others a lot, but she never went out of her way to hurt me. So she got a pass. She became my personal nurse."
Anri nodded, listening carefully.
"Tachibana and Kurokawa were… nice enough. Tachibana was begrudging and short-tempered, but she still did her job. Kurokawa was clingy and mean in her own way, but she never went full sadist on me like some of the others. So I'm more focused on claiming them. Making them mine. Pleasure over pure revenge."
He glanced at her.
"The ones who were truly cruel — Yamaguchi, Numajiri, Kiritani, the veterans — those ones will get the full treatment. More pain. More control. The dungeon will be less about fun and more about teaching them exactly what they did."
Anri's purple eyes softened with understanding.
"I see. So the scale is based on their original behavior toward you."
"Exactly."
She smiled faintly.
"That's very… consistent of you, Master."
Yamada kept walking toward the stairs.
"Hiramatsu is next. She's the lazy one. Indifferent. She used to fall asleep during treatment and play on her phone. Not the worst, but not good either."
Anri made a note on her tablet.
"Shall I prepare a balanced approach for her then? Some pleasure, some discipline?"
Yamada nodded.
"Yeah. Make the invitation sound professional. Same as before."
Anri bowed slightly.
"As you wish."
She turned and left to carry out the order.
Yamada continued up the stairs alone.
The criteria was simple.
How they treated him back then decided how he treated them now.
Fair.
In his own way.
Yamada walked into his bedroom.
Mochizuki was already there. She wore her pink-and-white nurse uniform, the short skirt swaying as she dusted the shelves. She didn't notice him at first.
Yamada stopped in the doorway.
'In one hand, I shouldn't. She's the one I decided to keep soft. The one who was actually kind to me.'
He watched her work for a moment.
'On the other hand… I've already crossed the line with the others. Tachibana. Kurokawa. Even the school girls. She's living in my house. Wearing the uniform I gave her. Calling me Master.'
He closed the door quietly behind him.
Mochizuki still hadn't turned around. She hummed softly under her breath while cleaning.
Yamada walked up behind her without a sound.
His hands slid around her waist from behind. Then higher. He cupped both of her breasts through the tight nurse top and squeezed.
Mochizuki froze. A small surprised sound left her throat.
"M-Master—?!"
Yamada leaned down and kissed the side of her neck. Soft at first. Then deeper. His tongue traced a slow line up to her ear.
Mochizuki's body stiffened, then slowly relaxed against him. Her cleaning cloth dropped to the floor.
"Yamada-kun… I was just cleaning…"
He squeezed her breasts again, thumbs brushing over her nipples through the fabric.
"I know."
He turned her around to face him. Her face was bright red. Eyes wide and flustered.
Yamada kissed her on the lips. Slow. Claiming.
Mochizuki made a soft muffled sound against his mouth. Her hands hovered in the air for a second before settling on his chest.
When he pulled back, a thin string of saliva connected them for a moment.
Mochizuki looked up at him, breathing faster.
"Master… you're being sudden…"
Yamada's hands stayed on her waist.
"You're my personal nurse. This is part of the job too."
Her cheeks burned even hotter. But she didn't pull away.
Instead, she gave a small, shy nod.
"O-okay… if that's what you want…"
Yamada kept kissing Mochizuki slowly.
His hands stayed gentle on her waist. He didn't rush. He didn't pull her hair or force her down.
Mochizuki's body slowly relaxed against him. Her shy hands finally rested on his chest.
He guided her back toward the bed without breaking the kiss. When the backs of her knees hit the mattress, he carefully laid her down.
He climbed over her, still careful with his weight.
"Master…" she whispered, face bright red.
Yamada kissed down her neck. Soft. Slow. Then he sucked gently on the side of her throat, leaving a dark hickey. He moved a little lower and left another one on her collarbone. Then one more on the upper curve of her breast once he pulled the uniform top down.
Mochizuki shivered each time, letting out soft, breathy sounds.
He undressed her carefully. The nurse uniform came off piece by piece. Bra. Panties. Until she was completely bare beneath him.
He took his time looking at her.
"You're soft," he said quietly.
Mochizuki covered her face with both hands, embarrassed.
Yamada gently pulled her hands away and kissed her again. Then he moved lower.
He licked and sucked her nipples slowly until they were stiff. He left another hickey just below her left breast. Then another on the soft skin of her inner thigh once he spread her legs.
When he finally entered her, he did it slowly. Inch by inch. Giving her time to adjust.
Mochizuki's eyes fluttered. A long, soft moan left her lips.
"Ah… Master… so gentle…"
He moved inside her with steady, deep thrusts. Not rough. Not punishing. Just thorough and warm.
Every time she got close, he slowed down and kissed her neck again, leaving more dark marks. Her collarbone. Her shoulders. The tops of her breasts. Soft purple evidence that she belonged to him.
Mochizuki clung to him the whole time. Legs wrapped around his waist. Soft moans filling the room.
When she came, it was quiet and trembling. Her body shook against his. Eyes half-lidded. Mouth open in a soft, pleasured expression.
Yamada kept thrusting through it, still gentle, until he came deep inside her.
He stayed buried in her for a while after, kissing the fresh hickeys on her neck.
Mochizuki's breathing slowly evened out. She looked up at him with watery, satisfied eyes.
"Master… you marked me a lot…"
Yamada brushed a strand of hair from her face.
"You're mine. I want people to know."
She blushed deeper but didn't argue. Instead she nuzzled against his chest.
He held her close.
Compared to the rough, leash-and-bench sessions with Tachibana and Kurokawa, this was completely different.
Softer.
Warmer.
And just as claiming.
Meanwhile in a different place.
Tachibana and Kurokawa sat across from each other in Tachibana's small apartment. The TV was off. The only light came from the window.
Kurokawa stared at Tachibana's phone for a long moment.
On the screen, one contact name stood out clearly.
Master
Kurokawa looked up at Tachibana. Her usual teasing expression was gone.
Tachibana noticed the stare and quickly looked away. She crossed her arms and turned her face toward the wall.
Kurokawa's voice was quiet.
"…So. You broke."
Tachibana's shoulders tensed.
"I didn't break."
Kurokawa leaned forward, resting her elbows on her knees.
"You saved his number as 'Master.' You go to his house every few days. You let him put a collar on you. You come back with marks on your neck and a look in your eyes that says you liked it."
She tilted her head.
"That's breaking, Tachibana."
Tachibana stayed silent for a few seconds. Then she let out a short, frustrated breath.
"I still have my pride."
Kurokawa gave a small, tired smile.
"So do I. And look where we are."
She leaned back against the couch.
"I used to make fun of people who got attached. Now I get excited every time that door opens. I wonder if he'll use the leash on me again."
She looked at her own phone. The same contact name sat there.
Master
"We're both already his. We just haven't said it out loud yet."
Tachibana finally turned back to face her. Her expression was complicated — annoyed, embarrassed, and something softer underneath.
"…Shut up."
Kurokawa laughed quietly.
"Yeah. That's what I thought."
Kurokawa leaned back on the couch and stared at the ceiling for a moment.
Then she spoke.
"Hey… what if we just ask him?"
Tachibana looked at her.
"Ask him what?"
"If we can just move into the mansion."
Tachibana's eyes widened a little.
"You're serious?"
Kurokawa shrugged.
"We're already going there almost every other day. We sleep over sometimes. We eat his food. We use his bathroom. At this point we're just pretending we still live here."
She glanced at her phone again.
"And if he already has us saved as… well. You know."
Tachibana was quiet for a few seconds. Then she let out a long breath.
"Would he even agree?"
Both of them fell silent.
At the exact same time, the same image formed in their heads.
Yamada sitting in a high-backed chair.
Wearing a perfectly tailored black suit.
Legs crossed.
One hand resting on the armrest.
Crimson eyes calm and cold.
Looking at them like a CEO looking at two employees who just made a request.
And then, in that same calm voice:
"Yes."
Kurokawa blinked.
Tachibana blinked.
They both stared at each other.
"…Did you just imagine the same thing?" Kurokawa asked.
Tachibana nodded slowly.
"Suit. Chair. That look. And him saying yes."
Kurokawa let out a short, nervous laugh.
"We're already so far gone."
Tachibana covered her face with one hand.
"I hate that you're right."
They sat there for a while longer, neither of them speaking.
Outside, the sky kept getting darker.
Eventually Kurokawa stood up.
"I'm going to ask him next time I see him."
Tachibana didn't stop her.
She just stared at the floor and muttered:
"…Me too."