Droning on about the possible solutions to her subject's situation, Celestia kept a firm hoof on her beloved student's head, feeling her struggle slightly between her hind legs. Being this a serious matter, the princess had been advised against having her in the room during the meeting, but feeling pent up and adventurous she decided this was the perfect time for a lesson.
So, having told her protege to keep quiet no matter what, she felt as the small mare slowly pushed more of her huge horse cock into her mouth and down her throat. Having been practicing daily by now, Twilight had just about mastered her technique and was closer than ever to managing her teacher's cock all the way to the base.
Thus, with barely concealed excitement, the alabaster princess finally noted the gentle touch of the filly's nose against her soft underbelly, feeling the complete encasing of her member in the warm cavern of her maw, massaging her every time her muscles contracted around her. The princess's eyes almost rolled back into her head in pleasure before she noticed Twilight starting to backtrack.
Unwilling to loose this sensation so quickly, she placed her hoof against her head and pressed her forward, the student's nose and chin now firmly squished against her. The lavender mare squirmed slightly, feeling the lack of air starting to gnaw on her, but happy to give her teacher a longer moment of pleasure.