Today was Asuna Ichinose's turn to clean Sensei's office. As she arrived, she noticed that Sensei wasn't there. Instead, the only person in the office was Sensei's best friend, Alex. He was a big, muscular, bald black man who always had his eyes on Asuna because of her huge breasts and sexy body.

Interrupting her cleaning, Alex approached Asuna with a lecherous grin, and she felt a surge of fear. But she knew she couldn't refuse him. After all, he was Sensei's best friend, and Sensei made it clear that all the girls had to obey Alex.

"Now, we're going to have some fun," he said, his voice low and menacing.

Asuna's heart raced with fear as Alex began touching her, his hands exploring her curves.

"Please, Alex... I-I don't want to do this," she stammered, her voice trembling with fear.

But Alex just chuckled darkly, his grip tightening on her arm. "You don't have a choice, sweetheart. Sensei's orders."

With a sinking feeling in her stomach, Asuna reluctantly complied, knowing that she had no other option.

He made her give him a blowjob, and she was shocked by the size of his penis. Then, he instructed her to use her big breasts for a boob job, and she reluctantly obliged.

Finally, he bent her over and started having sex with her, and Asuna could do nothing but submit to his desires.

As the hours passed, Asuna found herself losing track of time, lost in a haze of pleasure and fear. She orgasmed over and over, her mind consumed by the overwhelming sensations.

After what felt like an eternity, Sensei unexpectedly returned to the office and found them both sitting on the couch.

Asuna's heart sank as Sensei's eyes narrowed in suspicion. But to her surprise, he just smiled and said, "Looks like you two are getting along well."

Asuna's cheeks burned with shame as she realized that Sensei was completely unaware of what had transpired. But little did he know... Asuna was now a BBC-only type of girl, completely enthralled by Alex and his big black cock.