Install hidden cameras.

After Mike had a few minutes to recover his mother came back downstairs.

"Right, you've had enough time to recover.", she stated, "Let's get to work. Now, I have $200 dollars here, I want you to use this money to buy 4 hidden cameras and return the leftover money. Once you have obtained the hidden cameras, I want you to connect them to Wi-Fi transmitters, and then I want you to set two of them up in your sister's bedroom while she's out with friends, and also set the other two in your bathroom. I then want to see you wank over footage or your own biological elder sister undressing and/or sleeping by the end of tomorrow. Am I clear?"

For how angry his mom had seemed early in the morning, she was actually acting pretty normal. Mike agreed to her orders. "I'll do it".

"Don't delay young man." she beamed as he left the house. He didn't even dream of refusing this order so he got on it right away.

The drive to the shop was uneventful, as was the shopping trip itself. He wondered if the cute checkout girl had any idea what he was planning on doing with them. Like, it was obviously normal for him to do something like that since his mother had ordered him to, but he knew it would seem outrageous to someone else. If she did know, would she view it as a good thing that he was doing his ... Chores? He zoned out for a bit there.

"Why do I feel like something is not quite right... Something feels weird as if it's... abnormal." Mike whispered. Unfortunately, it was loud enough for the cashier teen girl to hear just as she was handing him back the change.

"Weird huh? I have been feeling the same for a week or so. You know what, hand me all the money you have. That ought to make you feel lighter."

Mike though for a second before handing her the $40 change he had received back. He also gave her the $100 he kept stashed in his phone case for emergencies.

When he got home with the cameras, he immediately showed them to his mother. Much to his relief, she concurred that they were good quality. He quickly handed over the receipts and informed her where the rest of the money went. Now all he had to do was set them up. He could do the bathroom ones immediately. Still, it was gonna be a few hours before his sister left so he had some time to kill. "MOM! he called. "ANYTHING YOU WANT ME TO DO NOW?"

"I SET UP A TO DO LIST FOR YOU TO CHECK!" She yelled back. "IT'S ON THE KITCHEN TABLE!" It was hard to her her shouts over the loud Yaoi JOI she was presumably masturbating to.

Sure enough, he could find the list. It has wet streaks on it. They smelled like her pussy. He decided to do them in order from first to last.