After the first time the both of them cummed, Natsu and Rias could no longer keep their hands off of each other.
In the end, the two only stopped after spending almost five hours having non-stop sex.
Even then, Natsu only stopped because Rias could no longer keep it up, and had already fainted and woken up a few times.
If not, who knows if the two of them would've stopped having sex even after the sun rose up.
Anyway, due to what he experienced Natsu was filled with an intense desire to increase the level of the Great Tokyo Dungeon as soon as possible.
Because, according to Rias, when Natsu's main Dungeon's level increased, that was when her capabilities as a living being would increase as well.
Sure, she won't be able to fight against intruders. But, after the Dungeon levelled up, she could have sex for a longer period of time, stay awake without any sleep for a week, and so on.
"Darling.... Wake up, darling... "
Waking up from his body being shaken, Natsu didn't even open his eyes and asked, "What is it, Rias?"
"It's time to wake up, darling. You're always up by this time."
Gurnitng and turning over, Natsu said, "Five more minutes."
"No! You have to wake up, darling!"
Opening his eyes, Natsu looked towards Rias who was setting up breakfast on the small table inside the bedroom, with her body vent over and ass pointing towards him.
Licking his lips and gulping simultaneously, Natsu got off the bed while still naked and hugged Rias from the back.
"You look like a newly married wife, Rias."
Blushing happily Rias was about to accept the compliment, when she realized that Natsu was naked and his dick was growing hard against her butt.
"You... First wash yourself, and eat something."
As Rias spoke with a great amount of patience, Natsu didn't think much and gripped her breasts through the kimono she always wore.
Smelling her hair which was still a little wet, Natsu said, "Your hair smells great. And you even sound like a wife."
Not falling for the compliment this time, Rias moved Natsu's hands away and turned around with a stern face.
But before she could say anything, Natsu suddenly started kissing her and turned her strict face into one which was melted with happiness.
"Darling... "
"Let's enjoy ourselves first."
"But... I just finished bathing."
"No worries. We can enjoy ourself in the bathroom as well."
Rolling her eyes and giggling a little, Rias started kissing Natsu back and cutely said, "You're so hopeless, darling."
...
From that day onwards, it had been about two weeks and Natsu still felt more free, happy, and refreshed than he ever did.
Sex with Rias really changed Natsu's life.
Having sex with Rias wasn't even remotely the same as when Natsu was with Amanda. And this wasn't in a sexual way.
Sure Rias had a body, which Amanda couldn't compare to. But this was more than just sex.
When Natsu has sex with Amanda, despite the fact that it felt good. He'd always feel as if he was going through some sort of a business transaction and not be able to feel truly satisfied.
But with Rias, it was a completely different feel.
With Rias, Natsu could completely open up to his desires and truly enjoy having sex with her from the bottom of his heart.
Natsu could truly be intimate with Rias, and not have to worry about anything else.
Also, other than this, Natsu finally took the mysterious girl's advice, and began sharing his feelings, how his day went by, his aspirations and so with Rias.
And he had to admit, just like the voice had told him, women truly were very good listeners.
No matter how boring Natsu's day might have been, Rias never once interrupted him, or asked him to stop and listened to everything that he had to say.
Furthermore, after she had sex with Natsu, even though he always went to sleep clothed when possible, and Grayfia would sleep in the bed with him when he didn't have sex with Rias, Rias herself would always enter the bed naked and tempt Natsu so much, that he sometimes couldn't even sleep.
If there was one thing which Natsu couldn't be satisfied with, it was at how slow the XP of his Dungeon was increasing by.
Because, with everything that was happening, Natsu truly couldn't be satisfied with just a few hours of sex with Rias, and wanted to have a non-stop marathon for a whole week.
But while his Lvl 3 body could do that, Rias's couldn't do so, which made him feel frustrated with himself and the scared adventurers who were running away at the smallest sign of trouble.
Anyway, Natsu truly was happier than he ever was, and out of this happiness came an idea which would make Natsu one of the most successful Dungeon Masters in the future.
On the other hand, what was originally a single Fire Goblin, due to the way Natsu treated it, there were now a total of 30 Fire Goblins inside his Dungeon!
Some of them were born as Fire Goblins, while the others evolved due to the envy they had toward the one Fire Goblin who was receiving special treatment.
Either way, Natsu had crossed the minimum requirement for obtaining the rights to purchase a special monster Race from the system.
As of yesterday's morning, Natsu had a sixth monster he could buy inside the Great Tokyo Dungeon. And that was -
[Fire Goblin - 500 DP]
It did seem a bit pricy for a Goblin species to cost so much, but what Natsu saw in this wasn't hoe much it cost to buy one, but what it meant for the Fire Goblin to cost so much.
Didn't it indirectly mean that a Fire Goblin had the same worth as a Dwarf?
Also, after the Goblin Race had managed to evolve, the other monsters Races inside the Dungeon had also started showing signs of evolving.
This included both the Kobolds, and the Orcs.
As for the Fairy, and the Dwarfs, hoping for them to evolve when they weren't living inside the fire based lava terrain, and instead inside the normal Dungeon terrain, it was nothing more than a pipe dream.
*****
[Dungeon Name : Great Tokyo Dungeon
Maid : Grayfia
Dungeon Lvl : 1 (XP : 1686/10,000)
DP : 606,551
Personal Guard : Erza Scarlet
Number of Dungeons Monsters : 1,596
DP Produced Per Day : 275]
Dungeon Master Natsu's Aggregate Dungeons' Stats -
[Number of Dungeons : 12
Dungeon Names : Great Las Vegas Dungeon (Lvl 1), Great Hokkaido Dungeon (Lvl 1), Great Seoul Dungeon (Lvl 1)....
Proxy Dungeon Masters : Amanda Fletcher
Maids : Orihime
Total DP : 1,314,634
Personal Guards : Yoruichi Shihōin (Grade : SSS), Nana Shimura (Grade : SSS), Retsu Unohana (Grade : SSS)…
Number of Dungeons Monsters : 11,572
DP Produced Per Day : 3,300]