You were an incredibly quiet young woman anyway, so a vow of silence would be an easy way to prove yourself (plus, you weren't fond of the idea of corporal punishment - what was that anyway, getting caned?).
You said as much to the Mother Superior, who had a thin smile on her face.
"Good choice," she appraised, and you felt pride bloom in your chest at the approval of the older woman, "unfortunately, however, here at Saint Ophelia's we operate on an "earned trust" basis. Until you can prove that you will stick to your vow even when nobody is there to watch you, I'm going to have to make sure you do."
"Wh-" In a second, the Mother Superior was on you, a large yet soft hand covering your mouth and her ample chest pushing against your face, the other hand keeping your head there in a weird cradling movement.
"See? Talking is such a natural action that you almost went back on your vow right after making it. Someday it'll come easy, but for now you need help." Her tone was sympathetic, yet slightly condescending. She had a point, though, and her being so close made it hard to think.
She removed her hand, and you dutifully kept your mouth closed.
"Now, open wide," she purred, and you did so without thinking.
Within a split second you felt something soft filling your mouth - a cloth maybe? - and the soft instruction to "Don't spit it out", before the Mother Superior stepped away again, leaving you standing with soft cloth stuffed in your mouth. There was a mirror on the wall across from you, and as you looked you could already barely recognize yourself - your usually neat hair was mussed up from the brief manhandling you were victim to and your face was flushed. Still, you couldn't bring yourself to spit out the cloth, which you could now see was white.
"Ah, got it!" The Mother Superior piped up, and your eyes flicked over to her only for your jaw to drop.
In her hands was a huge red ballgag.
Was this a joke? Were you being pranked? Had someone broken in to the church to take advantage of the nuns and her? Or was she serious?
The latter seemed to be the case, as there was no reaction to your clear distress other than an almost childish giggle. The Mother Superior walked - no, sashayed over to you - and tilted your chin up with the free hand.
Why hadn't you spit the cloth out? Why hadn't you moved to leave as soon as she'd pushed it into your mouth? Why were you still providing no resistance?
"Oh, I love it when they don't fight, you naturally submissive girls are adorable," Mother Superior cooed, and the praise went right to your pussy.
That's why.
"I know this seems ****, but it really is the only way to be sure you're not speaking when you shouldn't," she said, before holding up the shining red rubber ball to your already **** open lips. You wondered how she was going to fit that monster into your mouth, especially when it was full, but somehow she managed, leaving you to get used to the foreign feeling while she tightened the straps behind your head (and she was far from lenient with that).
"I'll let you try and speak now," she purred, and you gave a few extremely muffled mewls around the gag. That seemed to please her, as she hummed in approval.
"If this was a punishment, I'd add even more layers, but I do love the way your lips look wrapped around that ball," you blushed almost as red as said ball.
"Well, time to give you the rest of your clothes," she says, and drops a bundle of black fabric that you recognize as a nun's habit in front of you.
She doesn't help you get changed, but luckily you figure it out fairly quickly (if not fumbling slightly under her appraising eye) and soon you're dressed, gag and all.
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