"Not quite, this is more literal. The monks hid their demon down here in an inner chamber. It was caught quite some time ago, trying to sour the dairy's milk. But the monk who caught him knew how to both capture him, and keep him from growing stronger and becoming a real menace to folks. But while the fellas could chain him, they couldn't drain him. If you don't milked him, his power and evil begin to strengthen. But sap him of his vital fluid, he's a relative pussycat. If he's getting his treat, he stays relatively sweet. So our order was formed to keep this evil one in check."
"An unusual duty for females who took a vow of chastity, but this is a holy duty, sanctioned by the hierarchy." Sister Grace wondered again about what was extra-sinful. Was it 'outside of sin'; like extramarital was 'outside of marriage'? When it is a sanctioned act, acceptable in the judgment of the Church, even though it otherwise would be a venal sin, is it okay to enjoy it? Or would it a sacrilege? What could the mysterious sacrifice be? She already took a vow of poverty, as well as no sex; what else was there to give up that she hadn't already?
The Mother Superior made sure she had her newbie's attention. "This is giving up your virginity, you don't have to be a virgin to be a nun." But of that, Grace knew from firsthand experience. "Many of the girls like this duty, it's not all that unpleasant. In fact, it can be rollicking fun most times. By letting the demon spew his evil seed in us, we keep him in check. Then we douche with holy water mixed with a spermicidal. You'll understand better when you meet our little imp; only, not so little where it counts!" The elder chuckled at that last aside. She opened the door, ushered the younger nun in before her. She closed the door quickly for safety.
There, chained by his ankles and around his neck, with collar and cuffs, was a true live demon. He had the horns and he was ugly and there was a tail, with a barb on the end, just like the illustrations in the books. He, it, was dressed only in a simple shift of a long shirt, though that didn't cover his risen member. For he not only had horns, he was mighty horny. Which was obvious from the look of the raging phallus that was a hell of a salami, for what otherwise looked like a awkward adolescent. But boy with a big schlong. He was chained to the wall, but his links stretched to a very wide and soft bed.
Sister Grace couldn't believe what the Mother Superior had been hinting at, or even been blunt about. Now she could hardly believe her eyes as the head of her order climbed up on the bed and rolled to her back with open arms for her demon lover! Jesus! No wonder the old gal is so cheerful! She's getting laid, perhaps on a regular basis. Likely there was a fair-share schedule made up so each girl in the Convent could get her turn to milk the nasty kid with the horns in his head and a spike in his loins. Getting a 'piece of tail', took on a different sort of context with servicing the hormonal madness of a teen Beelzebub. Or was he servicing them?
Mother was now about to make merry with the male half-ling, or perhaps changeling, difficult to tell at this age. But like all kids, he liked to get his kicks, his treats, in this case daily pussy! The semi-bestial boy, brandishing his sword of flesh, all but attacked the mature woman who welcomed him with panties drawn aside and pelvis raised. His tail whipped, lasing back and forth, as he entered her. His expression was eyes closed, tongue out, and he was breathing through his mouth. But his thick dick plunged in her quite ready and exposed quim. It settled in half penetrating, then slid in all the way, and withdrew to repeated the cycle of sex, the in and out, the mechanics of the act.
But Mother Superior was having a swell time; she laughed and encouraged the abomination to, "do it harder to Mommy Superior!" Her habit high around her hips, her nylon stockings showing the scandalous saucy scamp she was underneath. Sister remembered at that point that she was to pray for the Mother Superior's soul. Now she understood why. Because you could get to like the sin too much. It was supposed to be a sacrifice, not a pleasure unto its own self. Thus you would be seduced not by the sex only, but also by letting a forgiven-sin be repeated for your own selfish motives. Next thing, the Church would do away with the confessional, Heaven forbid!
Misuse of a dispensation would lose you your place in heaven. So she prayed that the Mother Superior would not fall into the role of victim; as opposed to being a milk-maid, who simply enjoyed her work; but wouldn't necessarily want to have a fixation on the cow. So Sister prayed quite earnestly for Mother Superior's soul. But then she said thanks to the Almighty for her own blessings. The order and the fellowship of the sisterhood, the wonderful and terrific jolly Mother Superior; and the fact that she wouldn't have to give up completely the one thing she would really miss by being a nun. But with there being a hidden inner demon, her prayers were answered!