A pounding could be heard, as of falling water, and a white spray seen. 

A waterfall? Yes, there is one. 

But it is not such as those that fall upon the surface of the earth. Not the kind that are shone upon by the sun. 

This is a river that runs in the hollows of the earth, up its waterfall, up the great trunk, and onward to heaven. 

It is a great stone cavern carved out by water, over many thousands of years, work into just this shape. The rock has been worked by the unceasing flow into a  spectacular limestone cavern. It is startling forest in cold region that also has stalagmites rising up from the ground , and stalactites dangling like leaves from above.

It is a stone forest. A stream flows through it, complete with waterfall an a deep, dark lake. That lake gives off a faint emerald glitter. The water itself, however, it is not the source, it is the moss. The moss, which packs the lake bed, is shimmering. 

"Oh.... Wow."

So this is what it means to be speechless.

The girls gawk at the otherworldly scenery, unable to say anything. The damp but cool underground air blows across their naked bodies, wrapped in towels. 

Ivanna looks dubiously at Kurotsuchi who stands beside her. 

"Do you really think it's fine for us to get in like this?" 

"They said this place is for washing. So, it's fine."

Ivanna thinks Kurotsuchi is used to this sort of thing, because she seems to have no hesitation about exposing her snow white body.

Sylvia takes a quick look around then dip a toe into the water. That special chill of underground spring water send a shock through her. She gives an involuntary yelp, causing Sekrit to giggle.

"It's even hotter than the water we used for washing back at the hidden village." Kurotsuchi says and slips her delicate legs into the pool, closing her eyes as if savoring the sensation.

"You from Sooka seems so good with this kind of thing." Clementine mutters with something like resentment, after which she slides slowly into the lake. 

"Why? Scared?" Sekrit teases Ivanna.

Ivanna, loath to be the only one left on shore, screws up her courage, and then all but charges into the water.

"Eyikk. Yike."

She feels the soft moss under her feet. She thinks she is about to slip on it, but almost immediately finds out that it holds her weight firmly. The water is cold at first, but she soon grows used to it and even find it feels pleasant. She thinks she is going to be fine here.

That encourages her to submerge herself up to her shoulders, the water supports her, and she sways gently back and forth in its embrace. 

"Aah." Sylvia finds herself letting out an easy, relaxed sound, her face turning red. She glances at other girls, whose expressions are much like her. That helps her relaxed.

"It's warmer than well water. I wonder why?" Ivanna mutters.

"I heard a story once that said there is a river of fire  that flows beneath the earth." Mirai says lifelessly. She cocks her head. 

"Come to think about it. Sylvia was a mercenary, should have traveled a lot." Kurotsuchi asks. 

"Lots of people become mercenaries, hoping to get their hands on hidden treasures." Sylvia offers. She holds her blond hair in one hand to keep it out of the water, while she listens to the girls' conversation. 

"The trust afforded to some homeless ruins-raider and that accord an established mercenary is very different." 

"Oh, yes. That makes sense." Kurotsuchi nods vigorously, droplets of water flying from her short hair.

Clementine is no longer harbouring much jealousy towards Sylvia since she showed off her love making to the girls, but still throws harsh words at her,

"If you are from noble family, you should have no problem being a knight." 

Receiving harsh words, Sylvia stares at Clementine.

"What? Am I rubbing your wounds?" Clementine provokes playfully, cocking her head. A droplet of water stumbles from stalactite, making tiny waves ripple across the lake's surface.

"You bitch..how!." Sylvia is about to jump to Clementine but is stopped by Sekrit, shaking her hand in a way that makes more ripple. 

"But... Damn you, barbaric girl. You were screwed by Hiro in front of us. Aaaaaa.... I am so jealous!!" Sekrit yells while splashing water towards Clementine.

"Yes. Like bitch in heat." Sylvia avenges with words.

"Fuck me. Fuck me. I am Hiro's slave!" Kurotsuchi comically repeats what Clementine says loudly during that love making.

Clementine sinks in the water up to her cheeks as if trying to hide the flush in her face. For a moment, the inly sound in the cavern is the rush of the underground stream.

"But... I really..." Sekrit's word is like a drop of water, and it too, ripples through the chamber.  "I want Hiro to make love to me."

***

Each of us is given a room but Sekrit is now lingering in my bedroom. 

I stand up without making any sound just like a wild animal. Incidentally, my dick also stands up. In front is a girl looking at the bed with her ass moving around. 

I slowly close on her back silently without making a sound. Even with her bent posture, I could see that she is slightly shorter than me. There is around a 5 centimeter difference in our height. Her slightly permed navy colored hair is supported by a hair clip, and it looks like it is rolled around the back of her head. She probably ties it up after bathing, but her nape is exposed, so it is quite alluring.

"Hiro?"

Sekrit notices that I am looking at her and turns around. She looks at me curiously with her dark eyes.

"I just want to look at you wearing the bathrobe for a bit. Can you stand straight and look here?"

She seems to be pleasantly surprised and turns towards me with her posture straight. I pretend to check her bathrobe and then move my eyes towards her chest. The bulging in the bathrobe is so huge, indicating how voluptuous she is.

"Turn around and let me see your back."

Sekrit turns her body around with her back turned towards me.  Her back is completely defenceless.  Ah, I couldn’t endure it. My dick is already standing hard. 

I gently hold her back without putting any strength. Just as I imagined, her body is indeed sturdy.

Flustered, Sekrit just stands straight up without turning around. I could feel her arms slightly shaking, but there is no feeling that she wants to run away.

I continue hugging her without saying anything. Her female smell tickled my nose, and it stimulates the desire within me. Pushing my face on her back, I take a deep breath and smell her scent. Staying silent, I increase the strength in the arms hugging her.

I remove my arms around her back and place it on her shoulders, and then I turn her around. Facing Sekrit, I hug her once more.

Suddenly, I hear Sekrit gasping. Moving my arms around her waist, I pull her body closer to me.

I gently kissed Sekrit’s lips as she is looking at me with a captivated expression. Kissing sounds resound inside, making the atmosphere hot. 

When I hug her back to give her a deep kiss, surprisingly, she also hug me too. After I enjoy locking tongues with Sekrit, I guide her towards the bed. 

I sit on the bed first and pat beside me to indicate for her to sit there. Sekrit walks closer gracefully, sits down beside me, and turns her body to look at me. As if being sucked by those eyes, I embrace her and gave her an intense kiss.

"nnnhmm……aaahhhn……nnnchu………haaaa……"

Maybe she has grasped the technique on how to use her tongue from our kiss a while ago, I am able to fully savour her. While gently caressing her big breast with my right hand and left hand resting on her shoulder, I continue exploring her mouth.

"Hiro..nnmchu……chu………aaahnn" 

Her seductive sweet voice sounded near my ear, and it was transmitted towards my dick. It feels good.  As if our bodies have become one through our tongues, I feel a hot mingling. I strengthen my left hand on her shoulder, and my right hand which is caressing her big breast as if tracing its shape had gradually begins to knead it.

Shortly after, Sekrit also moves her hands sitting on her thighs and places it on both of my shoulders. She then slide her arms and move it to cover my head. Her position is higher than mine, so her saliva flowed inside my mouth and further stimulates my desire.

"……cchu……nnn……chu……haa, haa……nnnmm!"

I suck her mouth intensely, but Sekrit doesn’t just stay passive. She returns it by sucking back. After indulging in a very long kiss, I reluctantly release her because I felt like I want to see her face. The scene when the thread of our saliva is hanging from our tongue is very arousing.

Immediately, Sekrit moves her hands to undress my pants. She seems to be having trouble removing another person’s clothes, so I help her by throwing off my pants and everything I am wearing below. I am wearing a shirt, but my lower body is only an exposed dick. If others are to see this scene, it would’ve looked very silly.

In the instant I am controlled by desire, I raise Sekrit’s chin up and kiss her. Our lips part, and while carrying her with one hand, my other hand is starting to invade her lower robe towards her unexplored garden. I don’t move there immediately but savoured the soft feeling from the soles of her feet, her calves, and her thighs.

Sekrit's body which is closer to a mature woman has more feminine curves than Sylvia whose body is still immature aside from her chest. Just as I touch her vaginal area, Sekrit shuts her legs tight and catches my hands in between. They feel so soft and warm.

I wriggle my fingers on her soft thighs before opening it. When I give her a light kiss on the forehead, her legs open, giving way towards her secret garden.

"Ah…"

When I gave it a slight touch, Sekrit let out a sweet breath which reaches my ears. And then, I could feel from my fingers that she is already soaking wet. I feel like teasing her for a bit. I rub her love nectar between my fingers which have become sticky and show it to Sekrit.

A transparent fluid is pulled like a thread as I open and close between my fingers.

I place strength on her arms and move her body down on all fours. As if sensing my intention, or she also wants it, she readily turns her ass towards me.

"A naughty slut needs punishment."

Matching Sekrit who is crouching on the bed, I stand on my knees and hold my erect dick. I pat her ass covered by her robe and examine its feel. Her ass feels very soft despite the muscles and it is splendid. No wonder there are no shortage of molesters in my previous world. This feeling is absolutely wonderful.

I pull her waist closer and roll her lower robe up to confirm her garden. Her pussy is already soaking wet and sparkling, appearing very eager to swallow a cock. 

I wouldn’t take her clothes off. I wanted to thrust my dick inside a young girl wearing bathrobe. At this moment, as if I am struck by a lightning which makes me understand a fact, I’d become certain of it. This is exactly the way of eating a girl.

I adjusted Sekrit’s spread thighs and match it with my erect dick. After adjusting her height, I move my dick just outside the entrance of her pussy.

I could feel something is squeezing my dick as I slip my dick inside her pussy. 

"Ahhgg!!"

Sekrit strengthens the hands grabbing the sheets while crouching. The feeling of satisfaction from fucking her causes my dick to grow harder.

Our bodies further stuck close together as I slightly bend my body forward. I feel at ease just feeling her body from above her clothes.

I lower my body to penetrate her deepest area. The tip of my dick heads straight towards her deepest area while being stuck and entangled inside her vagina.

"nnhhnm～….uuuhh～nnnhmm."

Watching Sekrit letting out seductive moans further stimulate my lust. I move faster and faster, in order to reach deeper inside her. My mind feel like it is screaming at me to conquer her body.

Shorty after, I arrive at her deepest. My dick arrived whole inside her pussy. When I roll her skirt upwards to look at our joined part, my dick has indeed gone completely inside her.

"Uhhh… Its, tight…"

"It's been a year since I last had sex." She confesses while slightly moans.

I stop moving and enjoy the sensation inside her vagina as it presses hard on my dick. Even without moving, it feels so great that I could ejaculate.

"fuuu, fuuuu……uuhhnn……"

I pull Sekrit’s waist while she is letting out a sexy agonizing voice and makes sure we wouldn’t separate. I firmly press myself on her to not separate from her moving vagina which is trying to push my dick back.

"Ahhnnn…"

I move my idle hand to stimulate and enjoy her reaction. Teasing her in many different ways, she seems to enjoy it when I press on her clitoris under my fingers. When I focus teasing her there, her moans are slowly changing to heavy breathing, and my palms are gradually getting wet.

"Haa……Haaa……Ahh, nmmm! haaa, ku…"

I want to thrust her, but I become too focused on playing with her pussy that I feel that I would cum with just the slightest movement.

"I like you. I like you, Master…I love you……"

It is a very loving confession.

I suddenly feel the feeling of ejaculation, and my mind feel like it is going to blank out. I pull her with all my strength, and the only thought that remain in my mind is to paint her deepest area with my semen.

Unconsciously, I am letting out a very loud cry as I reach my orgasm.

My mind feels like I vividly see the scene when my semen is released and filled the inside of her pussy.

Suddenly, her status appears on my dashboard.

"Name: Sekrit, Age: 19, Height:175, Vocation: Dancer 

Strength: 18, Speed: 24, Agility: 19, Reflex: 35, Stamina: 19, Durability: 18. 

Ability: Grace, Mid Air Movement"