Natsu didn't really care why the adventurers were suddenly raiding his Great Tokyo Dungeon so much, but right now, he was eagerly watching the DH System interface and waiting for it to notify him of any intruders.

After all, he was only 84 points away from making the XP bar reach a total of 10,000, which would obviously increase it's Lvl to 2!

How could Natsu not be excited and anxious for that to happen?!

Not to mention him becoming the first Dungeon Master to posses a Lvl 2 Dungeon in Earth, he'd obtain a Grand Lucky Draw, bonus DP, and access to more monsters and Dungeon Augmentation features through the shop!

Natsu was so excited that his face was unconsciously grinning from just thinking about the monsters he could buy from a Lvl 2 Dungeon.

Succubus?

Mermaid?

Cat woman?

"Why isn't anyone attacking?!!"

Stroking Natsu's hair like always since he was lying on her lap, Rias lightly chuckled and said, "I can guess that you are thinking about, darling. You are thinking of obtaining sexy women from the Dungeon shop, aren't you?"

Not hiding anything, Natsu honestly nodded his head with a lascivious smile.

"Yes."

Seeing this Rias's mouth unconsciously twitched, but she didn't say anything and along with Natsu waited for the DH System to notify them of any intruders.

"Aaaaaaaa! Not a single one is coming!!!"

Losing his patience within just a few minutes, Natsu decided to take his mind off the Dungeon by doing what he loved to do the most.

Have sex!

Getting up abruptly, Natsu began kissing Rias, who after being stunned by the pleasant surprise, starting kissing Natsu back.

Unfortunately, just as the two who started kissing each other could get into the mood, and start undressing each other, the DH System notified them of an intruder.

[Intruders detected!]

[1 (Lvl 1) adventurer has entered the Dungeon!]

"Fuck! Cock blocking me for one intruder?! Mute all notifications!"

Cursing and ordering the DH System to no longer send any notifications until he said otherwise, Natsu went back to kissing Rias.

Holding back her laughter, Rias didn't even have to do anything, as Natsu's hands skillfully removed the kimono she was dressed in.

Not thinking too much about it, since only wearing a kimono was hard, and given how Natsu enjoyed making her dress in different kimonos in front of him, Rias also similarly removed the clothes Natsu wore.

Having completely stopped caring about the one intruder inside his Dungeon, and more to come, since all it did was make him nervous, Natsu completely focused on the exquisite naked body of Rias in front of him.

Touching her all over, and making Rias's body tremble in pleasure with his tongue forcing its way inside her pussy, Natsu played with her pussy and clit until she orgasmed.

Not holding back, or giving time for Rias whose body was twitching from the orgasm to recover, Natsu took the opportunity to push his dick inside her well lubricated and awaiting pussy.

"Ahhhhh... Darlinggg!"

As Rias spread her arms in a trance, Natsu bent forward and kissed her while his waist started moving.

"Mmmm... I can say for sure that I'll never get bored with this."

In response to Natsu's words, Rias tightened and loosened the walls of her pussy, giving Natsu a completely different experience.

"I'll never let you get bored of me, darling."

Though what Natsu meant when he said bored, was in consideration to sex, he didn't correct Rias, since what she was doing felt quite good.

Moving his waist harder, and thrusting his dick deeper, Natsu managed to make Rias moan continuously and quickly brought her close to her second orgasm.

At the same time, Natsu also approached his limit and poured all of his eagerly waiting hot semen deep inside of Rias.

"Ahhhhh... Yesssssss!"

Moaning once her from the hot semen felt inside her, and then from her sensitive pussy orgasming for the second time, Rias who matured with the one month of regular sex with Natsu, didn't faint and clearly enjoyed every second of the orgasm.

...

After a total of three rounds of sex which filled the room with the scent of sex, Natsu hugged Rias to sleep with his dick still inside her, not even bothered about the fact that he blocked his semen from falling out.

Of course, he didn't actually need to think about it, because as it turns out, Rias could never get pregnant.

Anyway, after Natsu and Rias finished having sex, Grayfia entered the room like she always did, and got into the bed and hugged the naked Natsu from behind.

Grinning even in his sleep from the pleasurable warmth and softness which only a woman's breasts could give, Natsu hugged Rias even tighter.

Once Natsu had finished having sex with Rias, he unmuted the DH System. But due to how smart the interface was, it didn't disturb his sleep with petty notifications.

However, once the ten-thousandth adventurer was killed, Natsu was immediately woken up by the loud notification.

[Lvl 1 intruder has been killed. Obtained 500 DP.]

[The Great Tokyo Dungeon's XP bar has been filled.]

[Dungeon Level has increased to Lvl 2.]

[New items are available in the Dungeon Shop.]

[Dungeon Master Natsu's Great Tokyo Dungeon has reached Lvl 2!]

[Dungeon Master Natsu has been given 1,000,000 DP, and one Grand Lucky Draw for his achievement!]

These notifications hadn't just woken up Natsu, but even the rest of the world.

Seeing this notification the adventurers and Haven Lords all frowned hard, while the Dungeon Masters on the other hand, didn't know how to feel.

Should they be happy that it was a Dungeon Master who was creating records, and not a Haven Lord?

Or be angry and resent Natsu, who was growing too fast and would obviously turn into an overlord?

What many, however, didn't know, was that this very day would mark the beginning of large scale Dungeon wars. Because on this very day, taking advantage of this notification which grabbed everyone's attention, a Dungeon Master attacked the Dungeon which was closest to him by taking all the monsters inside his Dungeon, and successfully conquered it as well.

*****

[Dungeon Name : Great Tokyo Dungeon

Maid : Grayfia

Dungeon Lvl : 2 (XP : 10,003/100,000)

DP : 5,574,500

Personal Guard : Erza Scarlet

Number of Dungeons Monsters : 16,728

DP Produced Per Day : 550]

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Dungeon Master Natsu's Aggregate Dungeons' Stats -

[Number of Dungeons : 15

Dungeon Names : Great Las Vegas Dungeon (Lvl 1), Great Hokkaido Dungeon (Lvl 1), Great Seoul Dungeon (Lvl 1)....

Proxy Dungeon Masters : Amanda Fletcher, Anastasiya Smirnov, Shilpa Aurora...

Maids : Orihime

Total DP : 2,460,875

Personal Guards : Yoruichi Shihōin (Grade : SSS), Nana Shimura (Grade : SSS), Retsu Unohana (Grade : SSS)..

Number of Dungeons Monsters : 58,457

DP Produced Per Day : 4,125]