Christina's training - An essay for the Master

Christina is working hard on her essay.  The girl looks hopefully at the time in the corner of the screen, despite her efforts, simple calculations tell Christina that she is behind schedule and needs to speed up.  But any rush increases the number of errors that double her work and the young woman needs to choose a speed at which her work will be more productive and error-free, this damn glass of milk again distracted her attention... Christina collected her thoughts, thought through the further content of the essay and  continued to carefully press the keys, but new painful intestinal spasms again threw the girl into a fever, her gaze was riveted on the glass of milk in front of her.  Christina looked at the glass with hatred as if it were her sworn enemy.  The damn glass of milk seemed to mock the young woman, challenging her to an epic battle in which the strongest would win - the incompressible liquid rushing out or the girl’s trained anus?  Christina is forced to take a short break to endure the rumbling of her full intestines and painful spasms.  Despite this, Christina must gather herself and organize her thoughts for their further presentation in a text document.  Christina squeezes her thighs and tries her best to hold back the fluid mercilessly rushing out with her trained sphincter.  The master devotes a lot of time to training the girl’s tightly closed rectal rosebud and is pleased with Christina’s success in training her beautiful tightly closed anus.

 To Christina's relief, as suddenly as they appeared, the spasms pass with a grumbling sound.  The young woman can continue her work again.  The pounding on the keys resumed.  Christina needs to complete the task of her loving Master in time.