A Hentai System in the World of Danmachi.

Prologue.

As I finished watching the last episode of the third season of Dungeon Ni Deai, I looked at the bookshelf in the corner of the room where a pile of manga and light novels were placed.

Among them are many volumes of Dungeon Ni Deai. I am a fan, but I don't have all the volumes. 

"Should I read it from the beginning again? I don't have the money to buy the next volumes."

I had thirteen volumes in total, far from all the volumes available. The big problem is that I need money. I live in a room in my parents' house, and my mother asks me to get a job daily.

My last job as a cook didn't go very well. I set fire to the kitchen... A fucking disgrace. I was prosecuted for arson.

Fortunately, I won the case and didn't have to pay anything. It turned out that the gas pipe was broken. Fortunately, nobody died in that incident, but it was an enormous trauma for me.

"At least I improved my cooking skills then. Now, I can prepare Italian dishes with mastery."

I picked up the first volume of Danmachi and saw Hestia on the cover.

"She's fucking hot, isn't she? I'd do anything to have sex with her at least once in my life."

I lay on the bed and read the novel's first page when I felt something strange happening. A spontaneous erection, I wasn't even aroused. I felt like my cock was going to explode for a second.

What's more, it was hot.

"What the hell?" I stood up, startled, and pulled down my pants.

My cock was rock hard and kept growing in front of my eyes. My dick, which used to be 16 centimeters long, was now over 20 centimeters. Maybe 25? 

I touched my cock by instinct, but as soon as I touched it, I felt a shock run through my whole body.

SPURT~~

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My sperm gushed out with frightening force. My cum flew across the room and dyed the wall. I didn't stop cumming for a few seconds before I started to feel my whole body go weak.

My heart is racing so fast I think I'm going to have a heart attack.

While my cock was still throbbing, my consciousness disappeared.

####

"Hm? What?" I woke up slowly, still on the floor. My vision was blurry, and my pants were still down. I looked at my cock, and it wasn't hard anymore, but it was still huge.

My cock had almost doubled in size, what the fuck?

"Am I in my room?"

I saw the cum stain on the wall. 

Through the window, I could also see a building that didn't exist before. I used to live on the 8th floor of a building in New York, so I was used to seeing tall, modern buildings, but...

The building next to the window was made of wood and was... poor?

"Where the hell am I?"

As I approached the window and looked closer, I noticed I was in an unfamiliar place. There were many wooden houses around me, and I could hear some strange voices speaking in Japanese.

"Am I in Japan? No, it can't be."

People were carrying weapons.

[ New skill acquired! ]

[ The skill "Universal Language" has been added to your status! ]

"Hm?"

A sweet female voice spoke in my ear. Then, a blue screen appeared in front of me.

[ Welcome to the Hentai System! ]

[ Fuck girls to acquire new skills and also increase your status! ]

"What the fuck?!"

I widened my eyes and felt my cock get hard again.

[ First Mission has been given to the user! ]

[ Cum 10 times in 24 hours! ]

[ Reward: 10 points ]

"CUM 10 TIMES IN 24 HOURS?! THAT'S NOT POSSIBLE!"

But with my cock twitching wildly, I couldn't wait to cum. I think ten times is possible.

"But I'd like to investigate further to find out where I am... Urgh..."

I felt my cock aching. It was begging to be touched.

And a few hours later.

[Mission completed! ]

[ You have received 10 points! ]

Name - Luan Taylor

Nickname - None

Strength - 10

Agility - 10

Endurance - 5

Magic - 20

Perception - 5

Skills available for use: "Falna Editing LvMAX"

"Falna..."