It's probably in your best interest

You shamefully clean up what mess was made and make your way to your room. You go to strip your clothes and realize you left them downstairs. You embarrassingly remember that you're wearing a thong and decide it makes sense to wear it so Sami doesn't kill you.

You climb into bed and patiently wait to fall asleep. You have two class days left and then spring break starts. And it's gonna be a long spring break, that's for sure.

You wake up to your alarm and quickly turn it off. You get ready for the day like usual and make no effort to take off the thong. Knowing Sami, should would figure out a way to find out if you're listening to her or not. You walk downstairs to get on your computer to check your emails and run into Sami blocking your way.

"I hope you listened to me. You're wearing it, right?" You look at her and nod slowly. She moves up to you, reaches for your waistband and partly pulls your pants down. She chuckles and smiles to herself. "Awh, you're such a good boy." You quickly pull up your pants, thankful you wore her thong for your unscheduled inspection.

You make your way to your computer and did what you usually did while Sami watched TV. Eventually it was time to go and you went to walk out before Sami stopped you. "I hope you don't plan on removing your punishment later. Just a little hint." You take that as a yes that Sami will check up on you later somehow.

Class goes uneventfully other than the constant worry that someone is going to find out about your dangerous secret. You almost find it exciting, having a secret to keep from everyone. You make it to your second to last class and Sami texts you right before class starts. The text reads, "I hope you listened to me. Send me a picture in the next 3 minutes with proof." You mentally yell out a 'Fuck' in your mind as you realize you now have 3 minutes to make it to a bathroom. You walk as fast as you can to the nearest bathroom and find it's empty, thankfully. You get in the last stall and lock it. You pull your pants down just enough to see the thong and send Sami a picture of it just in time.

You receive a "Good boy." back and thank God that you made it. You wouldn't have liked what she would have done to you.

You continue class for the day and eventually make it home. It takes longer than usual since you have the constant worry of the string up your ass. You make it into the door to see Sami in the living room. You start to walk up the stairs to go to your room and study for a test you have tomorrow until Sami yells at you to come back down. "Get back here, I hope you didn't forget." You make your way back down the stairs and see Sami standing in the living room, arms crossed. You walk up to her and wait for instructions. "Show me." You understand exactly what she means and pull your pants down enough that she can approve of what she sees. "Good. Now I got you a present today after I went out shopping." Sami hasn't found a job yet but no doubt her parents have no problem sending her money.