My big sister is too annoying!

Frankly, even though Rei found out what they did, Mizuto was calm since, in the worst case, Rei would just get angry at him, and that's it. As long as he showed his regret, a pitiful expression, and an apology, everything was okay. 

Still, it was also unexpected that his stay would lead to something like that with Yuu.

Start with a kiss, touch, then fellatio. 

Next time, when they meet, then wouldn't it become sex?

Mizuto knew this was inevitable, and he wouldn't reject it. Still, he could think about those things later, as he needed to prepare his luggage for his trip to Tokyo. 

"Is this all?" 

"Yeah, that should be all."

Yume squatted by Mizuto's side as she helped him tidy up all the clothes and other things he would bring on his trip to Tokyo. 

Nevertheless, as they were so close, Mizuto couldn't help but stare at Yume. No, it should be on her legs, which were tightly wrapped in denim pants. Maybe it was because of his words that she told her that the more she wore the denim pants, the more comfortable they would become as the fabric would break apart and fit onto the wearer's body, so she had been wearing them many times. 

More importantly, Yume also didn't like to show her bare, so the denim pants were an excellent choice for her. 

Lastly, they were also a gift from Mizuto, so she loved them very much. 

Yet Mizuto also loved them, as he had to say that the shape of her legs became tantalizing with those pants. However, he didn't want to stare at them too long. It wasn't that he was a hypocrite, pretending to become a saint, who avoided the enjoyment that came from woman's flesh. Instead, it was because Yume was no longer his little sister. 

A week had passed since the bet, and their relationship had returned to how it was. 

Yume was no longer his little sister, but she returned and became his big sister. 

Yet, this return also made him feel helpless, especially with how worked up she was, as if she tried to avenge all the humiliation she had received during the week she had become his little sister. 

However, Mizuto couldn't deny that Yume was charming, especially when she tried to act like a capable big sister. 

Not only did she wear denim pants, but she also wore a light-colored sweater and tied her hair in a single braid, which she draped over her shoulder and chest. 

While she tried to become a capable older sister, Mizuto couldn't help but imagine how she would appear in the future when she became a mother. Sighing, he wondered whether it was weird of him to like an older woman, especially those mature women. 

"What's wrong?" Yume looked at Mizuto with a gentle smile. "Just say whatever you want to your Onee-chan." 

"....." 

Mizuto's lips twitched, and he sighed helplessly. 

Watching his defeated expression, Yume smiled smugly since she knew he loved this appearance of hers so much. Staying with him, she tried to learn many things about him, and she also understood instead of the gorgeous and sexy women with relieving clothes, Mizuto loved something that was more subdued and modest. While she wasn't sure the reason, she also felt more comfortable with this type of clothes, so she didn't mind and even tried to indulge him since the more he was crazy about her, the better it was. 

His trip to Tokyo was something inevitable, especially when he went there for a job. 

Yume also supported his job, but she would be lying if she wasn't worried, considering how charming he was. In Kyoto, where the women were famous for their research, many housewives and young mothers were seduced by his charm. What if he came to Tokyo, where everything was so open?

"What's wrong?" Mizuto asked, wondering why Yume's expression suddenly became cloudy. 

"If a woman seduces you in Tokyo, what will you do?" Yume asked curiously.

"....." 

What kind of question was this?

While Mizuto was helpless, he said, "I won't do anything." 

"Huh? Really?" 

"I don't want to get sick." 

Yes, some people might get heated up and even excited when a woman tries to approach them and invite them on a one-night stand, but Mizuto refuses to do such a thing. 

On that hole, how many men had entered?

Instead of public transportation, Mizuto preferred something more private, like a housewife who had only been touched by her husband. 

Joke aside, more importantly, he also had a woman in Tokyo, so he knew that his days there would be spent on Sonoko Machida all the time. 

"That's great..." Yume sighed in relief when she heard his answer. Still, she looked at his nebulous region and thought that she needed to exhaust him so that he wouldn't be interested in the Tokyo girl. Moreover, her eyes couldn't help but wander toward the wooden hanger on the wall of his room. 

There was a black suit with a white shirt and tie. 

Those were the clothes that he would wear for tomorrow. 

Frankly, it was her first time seeing him wearing formal clothes, and she couldn't help but wish to see him wear them. 

"Do you want me to wear it?" 

"Can you?" 

Looking at the excitement in Yume's eyes, Mizuto was helpless. "Help me iron it again later." 

"Leave that to me!" Yume patted her chest, telling him that if there was a single wrinkle on his suit later, she would be responsible for it. 

Mizuto knew that he was excited when Yume tied her hair into a ponytail or twin-tails; Yume was also excited when she thought of him wearing a suit. While he wasn't a woman, he knew that a suit had always made a woman horny.

So, to indulge his big sister, Mizuto decided to wear his suit, which he had planned to wear the next day. He was about to take off his clothes, but he looked at Yume, who planned to stay. "...you are not going out?" 

"Ah? Are you embarrassed?" Yume chuckled, then teased him. "How cute~!" 

"...." 

Mizuto was in silence, then took off his pants directly, showing his penis in front of Yume. 

"...."

Yume was silent, looking up at Mizuto before she showed a composed smile as she tucked some of her hair behind her ear. "Geez... you are so spoiled. Let Onee-chan take care of this." Her hand stretched out toward his soft penis and massaged it slightly, causing it to harden, and she stood tall. 

"...." 

Mizuto hated Yume's smug face, but he would be lying if she wasn't charming.

Her hand was gentle, stroking him before she opened her lips and swallowed his cock into her beautiful lips as she looked at him dotingly.

"Is it good~?" 

While her mouth was stuffed with his cock, she asked that question, making her voice appear so lewd. 

Watching this scene, Mizuto realized he might need to educate this stepsister. 

"Ah~!" 

Watching the dangerous light in his eyes and how he pulled her into his embrace, Yume cried in surprise, but soon, her cry turned into a cry of delight.