Start by Eating Jake Jake no Mi

Masa thought that it would be easy to get Misla's blood, but it seemed it was harder than he imagined, especially when he realized the choice of her undergarments was so bold! 

Despite being a housewife and a good mother, Misla's undergarments were bold purple laces in color with a see-through fabric that made Masa able to see the whiteness of curvy parts within her chest. Yet, even so, the two obvious pointy parts in the middle of those white orbs were hidden well on her bra, but instead of making it less charming, it enhanced her charm even further as it made those who saw her current appearance even more eager to know what was hidden under. 

Masa knew this was wrong, and frankly, even if he had been with many women and should have calmed down, his body reacted in a way he didn't want to. 

This was why he decided not to take a bath with his aunt again, he thought. 

'Even though I know that I shouldn't show such a reaction...' 

Yet, watching his eyes that stared at her body like a beast before quickly lowering his head instead of hating it, his reaction brought a smile to her beautiful face. 

She might not be young, and she was much, much older than Masa, but even so, watching his reaction made her quite proud and happy at the same time. 

Yes, Misla knew that this was wrong, but for Masa, who had tried everything to help her, how could she not have a feeling? 

This feeling... like him, she knew that she had to suppress it, yet when she saw Serafall and others were by his side, she couldn't stop it anymore. 

While she knew that she had to treat him like how a normal relationship between aunt and nephew would be, she couldn't help but have a feeling more than that, especially with her current situation. 

Being married to a man who she didn't love, then being discarded right away after she gave birth to a failure, yet even so, as a mother, it was impossible to give up her son, and she tried to support her son in various ways despite his weakness. 

However, even if, as a mother, she was strong in front of her son, as a woman, it didn't mean that she could be strong all the time, and she also needed someone to support her, especially with how her life was. 

Even worse, she got this "Sleeping Disease," but everything changed when her nephew was born. She knew well that Masa would be special, and when he thought how he would work hard yet also try his best to free her from her disease, how could she not be moved? 

While Masa had a dirty plan in his head and never thought too much about his actions, it was different from Misla, who had received his kindness and care for a long time, as it was the first time for someone who had done so many things for her.

It might be something small and natural for Masa to help his family, but for Misla, his action meant something significant within her heart, especially when getting her blood might endanger him with the "Sleeping Disease." 

While Misla believed in him, she couldn't help but feel worried, yet knowing how stubborn her nephew was in a certain area, she knew that she couldn't stop him, and because of that, she thought to erase all of the regrets within her, especially if something might happen to him. 

Masa had grown up, and he had become a man who was loved by many, including her, but somehow, her familial love also started to distort into something forbidden that might make him disgust her, yet watching this reaction of his... made her happy, and an expectation was born within. 

"Aunty, you don't have to take off your clothes. It's fine if you wear your clothes." 

Still, Masa wasn't a horndog, so he quickly told Misla to put her clothes on. 

"It's fine. You want to do something grand, such as creating a cure for the "Sleeping Disease," right? Then, you need to be serious and shouldn't be affected by a small problem like this." 

"....." 

Watching his aunt, who seriously tried to teach him about the attitude that he should take to do deep research about the cure for the "Sleeping Disease," Masa remained in silence for a while before he decided to step forward. "Then... can you take off all of them?" 

"Okay." 

Misla was startled by Masa's boldness, but she didn't hate this part of him. Instead, she wanted him to be more aggressive instead of a coward and clear about what he wished for. 

Yet, Masa didn't expect that Misla would really take off her undergarments, showing her bare body. 

The two pointy pinky parts of her chest and the beautiful curves of her plump thighs and bottom were completely exposed. 

Still, the most important part, the part that should only be shown to her husband, was also shown. 

Regardless, as expected of a good wife, Masa thought since her pubic part was neatly arranged and wasn't messy even though she hadn't been touched by anyone. 

However, as Misla had said before, he had to be serious even though he knew his purpose was quite impure. Taking a deep breath, he came to her side and then took out the new injection that he had prepared beforehand. He didn't need much, but even so, he still needed some of her blood, and at the same time, he needed to observe her body, wondering whether there was part of her body that had changed due to her disease. 

"Look more closely. There is no need to hesitate." 

"..." 

Like a lioness, Masa thought. 

Even if his aunt was gentle toward him, sometimes, she was tough, or rather, she was relatively strict, but then, why the fuck did she put her hand on his lower body?! 

"...aunty, I have finished." 

Masa had taken a sample of her blood, and he had also observed her body for a while, so it should be over, but somehow, along the way, Misla would casually put her hand on his thigh, rubbing it, then slowly move upward toward the noticeable stiffness that was impossible to hide. 

"By the way, Masa, have you done that with Ravel?" 

"...why did you ask me that question all of a sudden?" 

Frankly, Masa hadn't done it with Ravel, but he wasn't in a hurry, and he felt like it was okay to wait until they formally engaged to each other. 

Yes, after he asked her to become his wife and she agreed, a formal engagement party was needed so they could announce this event to everyone, like how Riser announced his engagement to Rias to everyone, as this was a part of ethics and show the closeness of the relationship between two noble houses. 

It might be tedious, but this was necessary, especially for a high-class devil like them. 

"You should be prepared since you need to make an heir as soon as possible." 

"...that's still far away." 

"You can't take it lightly." 

"Then... what should I do?" 

Masa was helpless when Misla was so insistent on talking about this private problem.

"You need to learn it early so you can have a baby." 

"But... as a devil, it's hard to get pregnant, right?" 

The strong had a hard time making children; this was the natural law of this world. 

Still, with the ability of "Boosted Gear," Masa could make his sperm become more potent, so he didn't have that problem, yet let's keep this a secret, he thought. 

"Fufufu... there is no need to worry. I know a way to make it easier to get pregnant." 

"How?" 

When Masa was confused, an incredible tenderness and sweet scent from Misla started to envelop him. 

"Don't worry. I will teach you, Masa." 

"....." 

A hesitation happened in his mind since Masa never expected Misla to be so bold, but her movement was just so tempting and, at the same time—

"It's fine. We're just training. We don't do the real thing, so everything will be okay..."

Those whispers were like a sweet temptation, and this also made him lose his hesitation. 

"It's just training..." 

As Masa tried to deceive himself, he had to say that a married woman was really different from what he thought. 

Clinging to Misla tightly, Masa let out a comfortable sigh as she taught him gently.