"Mr. DiSouza, I appreciate everything you've taught me about piano over the years. Now that I'm 18, though, I have a new problem. Men have the right to use my ass while I play, of course, but I find that the motion of sex interferes with my playing. I hid a camera yesterday and took pictures of a man using me while I played. Can you look at these photos and advise me, please?"
"Of course, my dear! Let's take a look. Ah, here we go. Look at this first photo, before the man arrives. You're offering you ass nicely, but your posture needs improving. Your back is much too tense, and that angles your asshole towards the floor. I bet it was difficult for the man to mount you comfortably. Aha! I was right. Just look at the poor fellow. It was kind of you to leave a seat for him, but he has to rest all his weight on his hands so that he can thrust upwards into your anus. No no, this is all wrong.
"Here's what you need to do. Before you start playing, I want you to do some relaxing stretches. Next, as you take your seat, relax your back and arch it as you sit down, so that your ass juts out more, your tits are pushed forwards towards the piano, and your center of gravity is directly above the piano bench.
"Just consider how much this simple change will improve things. Your ass cheeks will naturally spread apart, putting your cute little anus on display and making you even more visually appealing. Your rectum will be aligned closer to the horizontal axis rather than the vertical, allowing the man to thrust forward, rather than upwards. This should be much easier for you, and more comfortable for the man, too.
"I see from these photos that this man fingered your asshole before fucking it, which was very polite of him. I have a sneaking suspicion, though: show me that cute little asshole of yours now, please."
"As you wish, sir. Here you go. Shall I spread my cheeks for you like this?"
"Yes, that's perfect. Now, I'll dip my finger in this oil here, just to be gentle, and... aha! Just as I suspected. Your anus is much too tight, dear girl. Feel how it squeezes as I insert just one finger. And now if I try two... oh no no no, this won't do at all. I can barely fit them in. See how difficult it is for me to slide my fingers in and out to the hilt. It's no wonder that the men are disturbing your playing. If they are endowed at all well they will struggle to penetrate this tight little asshole of yours. Here, open your mouth and clean these fingers off for me while I tell you the solution -- they got a bit dirty in your ass.