A few extra penalties

You quickly get to work, and the first thing you do is lower her skill, so she will hit the net most of the time and suffer more penalties. After that, you begin setting up new penalties depending on the amount of times she fails and hits the ball on the net. You then watch as she tries and fails again, hitting the net. She quickly got to her penalty, but when she finished, the trainer was waiting for her with more.

"It is clear this is not enough, so now you will suffer a number of penalties depending on how many times you hit the ball into the net. If you fail three times in a row, you will lay across that chair and I will spank you for a full minute, if you fail five times in a row you have to masturbate in said chair, and if you fail twenty times then I will fuck you in the ass and the lesson will be over. And you'll have to walk out with your shorts down, and with not top. Understood?", he told her, and she seemed mortified by what she was told, gulping at the idea of the penalties laid out before her.

"Yes, sir", she timidly replied again, though louder than last time so he wouldn't demand more. He seemed satisfied with it, so they quickly got back to the lesson. Shannon smirked at you as she missed her next shot.

"Good job with that. I might add more later on, but for now, let's just watch", she tells you, and you nod in agreement, ready to see your work in action.

It is no surprise to either of you when she misses the next shot, but the blonde looks mortified at what is coming now that she missed three times in a row. The man looks at her disapprovingly, and points her to the chair. Slowly, she makes her way to it, her face increasingly red before she finally reaches it and lays across it.

With her in position, the man quickly gets to her pulls her shorts and panties down to reveal her ass. Without giving her any warning, he begins to spank her, hitting the flesh of her ass with fairly strong strikes that cause the blonde to whimper. However, she remains in her position, ready to go through with her punishment.

It goes on for the full minute it is supposed to before he stops and helps her up, though it's up to her to pull her panties and shorts back up. After that, she quickly gets back in her place, ready to continue the lesson, and clearly determined to not fail again.

Unfortunately for her, thanks to your changes, she continues to fail, having to carry out the lap around the court again. Furthermore, her nervousness about the penalties seems to be making her worse too, compounding on your earlier lowering of her skills to make sure that her fifth attempt is actually far worse than any previous one.

Before long, the blonde is again on the chair, slowly masturbating, her shorts and panties discarded in the floor next to her. You can see that she is actually quite wet, and wonder if she got aroused from the spanking session. At any rate, her moans start to grow in volume and intensity, and it is clear she is in a lot of pleasure, despite her equally obvious humiliation at her situation. A quick look at a smirking Shannon tells you that she did do a few extra changes to her, which you quite like.

It isn't long before she manages to bring herself to an orgasm, a loud moan marking it and she squirms in the chair and her fingers are covered in her juices. However, her trainer gives no respite, not allowing her even clean herself up before they continue.

Her continued sexual activity and arousal do wonders on her skill, which worsens even more as things go on, and the penalties begin to stack up. After a while she is on the edge, with 19 stacked failures, and with the exhaustion and arousal of three masturbations, six spanking sessions and ten laps of the court. However, she doesn’t give up, even when she is aware of the final penalty.

The trainer, clearly annoyed, hits a lob at her, and she makes an attempt at returning it, even in her current state.