I am that male friend in the harem story

NOTE: I changed the musical instrument that he learned to the saxophone instead of the trumpet. 

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"Just the two of us

Building castles in the sky

Just the two of us

You and I."

(Just the Two of Us by Bill Withers and Grover Washington, Jr.)

As Ishigami sang, Chika played the piano, enjoying his voice before he started to blow his saxophone as the two began their duet. 

Piano and saxophone. 

The sweetest and most fun combination was when they enjoyed their time together. 

As for why the two started to play a musical instrument, everything started on Monday after his trip to Yokohama, but somehow, Chika wanted to go to the music room. 

While Ishigami felt weird as it was the first place they were together, he accepted her advance, especially since he hadn't been with Chika lately, even though she wished to be together. More importantly, she should be fine and have recovered, so he could go all out after this. 

So why the heck did they start a jam session instead of having done something as two lovers usually do? 

The answer to that came from—

Clap! Clap! Clap!

After a moment of silence, the audience of their session clapped their hands in amazement. 

Yes, Ishigami and Chika weren't alone. Instead, they had guests come to watch their jam session. 

"...Yuu, have you learned the saxophone before?" 

Yet, Chika ignored the audience and asked Ishigami with the most solemn attitude that she had ever shown in her life. 

"..." 

Facing such a question, Ishigami tried to remain calm despite the contradiction between her tone and her current appearance. 

"...no, I just learned it after I bought it." 

"Then, you are a prodigy...." 

Chika felt conflicted since she knew well how hard it was to learn a wind instrument, yet somehow, her man was able to learn it in just a short moment! 

More importantly, his skill wasn't even lost to those street performers despite only learning it for a while, which showed his great skill! 

"Have you thought of becoming a professional, Yuu?" 

"No." 

"Ah, that's a shame." 

"Not really." 

"Why?" 

"I can get closer to you this way, after all." 

"...." 

Chika took a deep breath, trying to stop the blush that was about to appear on her smooth cheeks, then looked at Ishigami with a gaze of admiration. "You are great, Yuu. Even if we're like this, you can seduce me." 

"...thank you." 

Still—

"So, Kaguya-san, Hayasaka-san, can you two kindly leave us now?" 

Yes, if there was a reason why Chika tried to hold off instead of jumping to her man like a nympho, it was because there were Kaguya and Hayasaka, who came to look at their jam session! 

"Then, let you do something lewd in this room again?" Kaguya looked at Chika with a helpless gaze. 

"We won't do such a thing!" Chika suddenly pointed her finger at her headband. "Look! What word is written here!" 

"...demon?" 

"That's right!" Chika nodded in satisfaction. "At this moment, I am a Demon Instructor, Chika! I will train Yuu so hard that he won't have dirty thoughts about me! Please believe me!" 

Yes, if there was a reason why Ishigami tried to control himself instead of retorting this silly woman, it was because Chika tied her smooth, pink hair in a ponytail and put on a headband with the word "demon" on it.

It was said that she was a demon instructor, but Ishigami knew well that as long as Kaguya and Hayasaka left, Chika would become a silly yet lewd succubus who would suck her man's dry! 

Yet, Ishigami knew that Chika wasn't the only succubus since Hayasaka, who sat next to Kaguya, was also a succubus! 

He wasn't sure whether Hayasaka's act was an accident or deliberate, but she opened her legs, showing him the inside of her short skirt and white, smooth legs clearly toward him with a slightly disdainful expression on her face as if she was disgusted by his eyes that kept staring at her legs, yet instead of hiding them, she opened them wider, so he could see better, which made him felt... so strange since being such a gaze should make him annoyed, yet why did he feel strangely excited? 

Somehow, when he thought she showed such an expression for him, yet obediently opened her legs for him, trying hard to endure the pleasant sensations on her body... he felt like... he should bring her out later. 

Still, Ishigami didn't have a strange hobby. Instead, at this moment, he was quite worried about a certain possibility, especially when he saw Kaguya was there. After all, he knew from Shirogane that the two would go out together on the weekend, and as this outing was the third time, Shirogane would confess his feelings. 

So, why was Kaguya by their side instead of going to Shirogane's side? 

A certain thought emerged within his mind, but Ishigami decided to remain blind about this. He knew that this was wrong, yet... he let out a long sigh inwardly. 

Still hearing Chika's answer, Kaguya only stared at Chika and asked, "Are you sure that you won't do anything strange?" 

"....." 

Chika blushed, realizing that her dirty thought was exposed. 

Yet, could she be blamed? 

When Ishigami blew the saxophone earnestly as they enjoyed their time together, Chika had to admit that her womb trembled, thinking of something that she shouldn't do.

However, like Eve, who had learned a forbidden knowledge from the devil, she couldn't control her desire, and... everything was clear, right? 

"But Chika-san is right." Kaguya looked at Ishigami and asked, "Have you ever thought about being a professional, Ishigami?" 

"No, I am not. I'm fine with just playing as a hobby, and I will just play for my family." 

"...." 

"...Chika-san, can you not do something lewd when there are the two of us here?" 

When Kaguya saw Chika suddenly kiss Ishigami's cheek happily, she couldn't help but complain. 

"It's fine. You know about us anyway, so it doesn't matter." 

"But that doesn't mean that you can do something like that, okay?" 

"If you don't feel good, then how about you get a man, Kaguya-san? It's nice, you know?" Chika smiled teasingly, but when she thought that Kaguya should date a certain someone, she didn't feel good when her best friend was taken by someone else, so—

"Ah, no! Kaguya-san can't have a boyfriend! Kaguya-san can only be mine!" 

All of a sudden, Kaguya was hit by immense pressure, yet instead of being hurt; she felt so comfortable all over since instead of something hard, what welcomed her was two softness, which was impossible for her to produce. 

'This softness...' 

While Kaguya felt gloomy, she also had to admit Chika's softness felt so comfortable, and she understood why Ishigami was in love with Chika. 

Still, as Chika hugged Kaguya, she looked at her man and asked, "Yuu, are you free later?" 

"..." 

Watching the excitement and clear lust in her eyes, all of them knew that Chika hadn't given up, but Ishigami knew that he had to disappoint her and told her to use her hands first since—

"Sorry, I have to go out with my father later."