For five consecutive days, Issei took on the A- and B-rank missions provided by the system.
The mission objectives were versatile, ranging from hunting down rogue devils to fulfilling various human requests. Thanks to Issei's relentless grind, his strength was now on par with a standard Demon King of this world, or an Awakened Demon Lord from the Tensura World.
This level of power put him in the same league as the Demon Kings Asmodeus and Leviathan, though he was still a step below Beelzebub and Lucifer. Even so, Issei was confident he could match them if he tapped into Ddraig's full power. Ddraig himself had confirmed that Issei's physical body was now more than capable of withstanding his true strength.
Furthermore, Issei's magical capacity had undergone a massive surge, approaching the transcendent levels of those like Lucifer and Beelzebub.
On the sixth day, Rias suddenly pulled Issei into her room. She pushed him down and sat on top of him in a highly suggestive position.
"Rias?"
"You've been ignoring me for the past five days. Why?" Rias's tone was cold, her sharp eyes boring into Issei.
"Ah, there's no specific reason. I just wanted to focus on increasing my strength."
"Hmm..."
"I'm serious! You can definitely feel how much my power has changed compared to before."
"..." Rias fell silent, unable to deny his claim. Once her annoyance at being ignored faded, another thought began to trouble her. "Your power has spiked at an unbelievable speed. How did you do it?"
Issei grinned widely. "Want to know?"
Rias nodded with a serious expression.
Suddenly, Issei flipped their positions, pinning Rias beneath him. Caught off guard by his speed, Rias couldn't react in time and blushed as she realized how intimate their position had become.
A shy Rias was an irresistible aphrodisiac; Issei leaned down and kissed her sweet lips passionately while pinning her hands above her head. Rias began to lose herself in the heat of the kiss.
Not satisfied with just a kiss, Issei's hands began to wander beneath Rias's uniform, kneading her breasts until they shifted shape.
"Rias... is it okay?"
"Mm... just don't be rough. This is my first time," Rias replied bashfully.
"I promise."
One by one, Rias's clothes were stripped away until only her red-and-black floral lingerie remained. She tried to cover her chest, her face flushed with embarrassment. Issei swallowed hard, overwhelmed by the sight. He pressed his body against hers, and soon, the two of them became one in the most blissful harmony in the universe.
It was a sleepless night for Issei and Rias. They shared their love until dawn, finally stopping only when they were completely exhausted.
Since it was Sunday and school was out, they were able to rest to their hearts' content.
...
Downstairs, the Hyoudou family was having a meal with Asia.
All three of them knew exactly what was happening upstairs and chose not to disturb them. However, Asia seemed to have trouble swallowing her food, her mind clearly preoccupied with Issei and Rias. Gorou and Miki Hyoudou looked at each other and let out a helpless sigh.
...
Issei slowly opened his eyes, momentarily stunned as the memories of last night's madness came rushing back. He sat up beside Rias, who was still fast asleep. He reached out and gently touched her crimson hair, which felt as smooth as silk.
He pulled a strand toward him, kissed it, and smiled softly. "You smell good."
Rias's eyelids fluttered open, and she looked up at him. "Ise... good morning." She tried to sit up, but the soreness below made her freeze in place.
"Morning. Don't push yourself. Just stay in bed if it still hurts."
"Mm." Feeling Issei's care, Rias obeyed and lay back down.
"Rias, I have a confession to make."
"A confession?"
Issei nodded, his expression becoming serious. "You want to become stronger, right?"
Rias's expression turned serious as well. "Of course. Do you know a way?"
"In that case, I'm going to make you stronger."
"Eh?" Rias couldn't quite grasp what he meant.
Issei reached out and pressed his finger against Rias's forehead.
[Rias Gremory's initial potential can be unlocked with Harem Awakening Authority! Unlock now?]
'Yes!'
[Unlocking successful. Further potential cannot be unlocked yet due to the current power limitations of the 'Lord of Harem' skill user!]
Rias's power immediately surged, skyrocketing to the level of a current Demon King or an Awakened Demon Lord from the Tensura World. Broadly speaking, Rias's power was now on par with Issei's, though she still lagged behind in terms of raw magical capacity.
Rias was utterly shocked by the sudden explosion of power within her body. "Ise... what did you do to me?"
Issei smiled tenderly, his eyes full of affection. "Can't you feel it? Our bond has grown even closer."
"...Now that you mention it, I do feel it."
"This is my special power. I can help the women I love unlock their potential and become stronger."
Rias's mouth fell open, forming a perfect 'O' shape.
To be continued...
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