She decides to give in

“I want to …” Miryam starts as she puts her hands on either side of your head. “… commit a sin.”
Then the nun puts her lips onto your lips and kisses you. Her kiss is aggressive. Like she has been starving for it. She is practically eating your face just as voraciously as she was eating that éclair earlier. Even forcing her tongue into your mouth. It is obvious she has no experience in this. You let your hands grope her butt cheeks again, both feeling and groping her soft flesh. Miryam softly moans while kissing you, clearly enjoying your ministrations. You have her. She’s given in to her desires. It is time for you to make the score.

You slide your hands back up Miryam’s body and rest them on her breasts. You squeeze gently and feel up her C cups. Miryam moans, then brings her hands to her habit. She quickly pulls it past her shoulders then lets her religious dress drop to the ground, leaving her dressed in only her lingerie and veil. As you watch this nun strip out of her habit, you calculate it won’t take long anymore until your dick is inside that virgin pussy of hers. Time for you to start casting your experimental spell.
You start summoning demonic magic and gather it in your dick. As your spell is powering up, the sex starved nun starts pulling at your shirt. She pretty much drags it from your chest, then forces you to the ground. You resist not even in the slightest, leaving Miryam in full control. By now this closeted slut is basically going to get herself screwed.

Once you are on the ground, Miriam quickly pulls off your pants and then your underwear. When your fully erect dick jumps out, she pauses to stare at it. Earlier today, when you barged into the showers, she already saw it in its flaccid state. Now she’s seeing it in its gloriously erect state and it makes her grin.
“Finally … after all those years … I’m not going to be a good girl anymore.”
Miryam stands and brings her hands behind her back.
“From now on … I’m gona be a bad girl.”
Then she takes off her plain white bra and throws it to the ground. Immediately after she hooks her thumbs into her plain white panties and pulls those down as well. Exposing you her pussy, as well as the red pubic hair just above it.
By now your spell has been fully charged and your dick is filled with corruptive demon magic. All that’s needs to happen is for it to go into her pussy and destroy her virginity. Then your demonic energies will flood into her and corrupt this little nun.
Now fully nude, with the exception of her veil, Miryam crawls on top of you. As she brings her hips above yours, your hands find her hips again. One of Miryam’s hands wraps itself around your dick. The other rests on your hips. She runs her hand up and down your shaft a few times while biting her lower lip. The hand on your hips then goes to her pussy. She spreads her labia wide open and aims your dick at her exposed virginal hole.
“Be sure not to just jam it in.” You say. “Break your hymen slowly. It’ll be less painful.”
“Alright.” Miryam replies without taking her eyes off your nearly joined genitals.
Then she puts the tip of your dick into her pussy and lets the weight of her body **** her pussy slowly down. As her pussy expands for your member, her hymen starts to receive strain. When it tears Myriam groans softly, feeling just a small discomfort. The second your charged dick destroys her innocence, the demonic energies stored into your shaft flood into Miryam’s body.

You have tried this on virgins before, through your hands, but to no effect. Their virginity keeps them safe like an umbrella protects from water. You also tried it on non-virgins, which didn’t work either. The demonic magic entered their body but didn’t bind with it and you never discovered why. Then you figured this spell had to be cast at the moment someone’s virginity was lost. Time to see if this test subject shows a different result.

As the corrupting magic flows through Myriam’s body, it makes slight alteration to her. The demonic energies slightly warp Miryam’s body, causing her lips and eyelids to darken and turn black. That is when you learned your spell only worked half. Perhaps you need to introduce the corruption more directly to Miryam’s body. So, you start casting the spell again. Only this time you cast it on your testicles. It will cause your sperm to lose its fertility, but at least it should further corrupt this nun when you fill her up.

“It’s gone.” The now dark eyed nun says. “My innocence. It’s gone forever.”
“How does it feel?” You ask.
Miryam closes her eyes and lowers her hips until half your dick is impaled on her pussy.
“Mmmmm, good.” She moans through her black lips. “I should have broken this stupid vow years ago.”
“I’m just happy you broke it with me.” You say.
Miryam giggles. “I bet you say that to every virgin whose pussy is on your shaft.”
“Only the beautiful ones.” You say with a smile.
Your words get Miryam to blush and she turns her dark eyes away for a moment.
“Right. So, your dick is in me.” Miryam says. “What do we do now?”
“Now, you ride me.” You say. “As slow, fast, gentle or hard as you want.”
Miryam nods, places her hands on your chest and starts slowly riding your dick. As she makes her inexperienced pussy slide up and down your shaft she leans back and surrenders herself to the pleasure.
“Oh man. This feels so good.” Miryam moans. “No wonder my parents were worried. If I had done this with my crush, I would have fucked him every day.”
“Now you’re doing it with a demon.” You say. “What would your parents say about that?”
Miryam looks down at you with a proud smile and says, “They would be so disappointed in me.”
She then pushes her pussy further down on your shaft, taking in three quarters.
“In fact, I want them to see me like this.” She continues while taking more of your dick with each downward thrust. “I want them to see the future they chose for me is broken. That I’m choosing my own future now. And if that’s a future filled with sin and lust, then so be it.”
Then Miryam finally pushes her pussy all the way down and takes your entire dick inside her.
“It’s in.” Miryam says triumphantly. “Your dick. It’s completely inside my sinful pussy.”
You smile at her and say, “Congratulations.”
“So, what now?” Miryam asks as she continues to fuck you.
You squeeze the nun’s butt again and say, “Now you keep going until you are overwhelmed by a surge of pleasure that rocks you to your core.” You say.
“Mmmm, perfect.” Myriam growls.

As you lie on your back in the shower room, the former pious virgin called Miryam starts riding your dick in earnest. She bounces up and down, searches for a good rhythm and lest the pleasure of sex consume her.
As she rides you, her boobs bounce hypnotically up and down as her body rises and falls. The lure of her untouched boobs overwhelms you and you reach out for them. Miryam sings a moan when you grope her C-cup.
“Yes, you fucking demon. Grab my tits.” The redhead moans. “Grope this horny nun’s boobs while my fucking pussy rides your demon dick.”
Noticing how much this nun yearns for her boobs to be touched, you decide to give her tits another squeeze.
“Ooooh, yes!” She moans as she fucks you faster. “Just like that.”
As you complete casting your spell, your sperm is now fully charged with demon energy. Now you need to get yourself to orgasm and dump your cum into this nun.
“Try rotating your hips.” You tell Myriam. “Talith likes to do that one.”
Myriam lowers herself all the way onto your dick and then starts rotating her hips.
“Oh! John! Your dick! It’s churning my insides!” Myriam moans. “It’s so good. I don’t think I can stop anymore.”
“Now try rotating and bouncing at the same time.” You say.
Like a little lamb, Miryam does exactly what you tell her. Both motions at the same time cause her to moan loudly, filling the tiled room with her cries of pleasure. At some point she even grabs the veil from her head and drags it off. Her red hair spills out and falls wildly across her shoulders. It matches well with her darkened facial features, making her look like a front woman for some heavy metal band. All of these things together bring your dick closer and closer to orgasm until you feel it throb with anticipation.
“John! I’m feeling something!” Miryam warns you. “It’s like … something gona explode inside me!”
“That’s your orgasm.” You explain to her. “Keep going and let it overtake you.”
“Yes! Yes! I’m going to cum on a demon’s dick!” Miryam moans while gasping for air.
“Mom. Dad. Look at your daughter. I’m having sex with a demon. And I’m not even married! Your pure daughter has become a sinner! And I love it!!!”
With Myriam so near to her orgasm, you quickly place your hands on her hips and start thrusting your dick upward, pounding her formerly virgin pussy.
The sudden thrusts cause Miryam to spread her darkened eyes and lips wide open. At the same time, you feel her pussy contract around your dick.
“Oooohh! It’s happeniiiiing! I’m explooooodiiiing!”. The nun screams as she cums.
As she cums, her sinful pussy grips and sucks on your dick so hard your orgasm is triggered as well. Your dick throbs and shoots wad after wad of infertile but corruptive sperm deep into her womb.

As Myriam orgasms she grinds her hips against yours, rotating them gently as you fill her up. Her hands rest on your hips, her back is straightened and her head hangs back while her eyes are closed and mouth is wide open in mid-moan.
While she is in this state, the corruption you put inside her latches on that what already attached itself to her essence and enhances it. As a result, two horns start to grow from her head. They start growing just behind her hairline. They quickly pierce through her red hair and continue growing. As they increase in length, they follow the curve of her head, similar to Talith’s, only Miryam’s curve sideways. The left growing towards her left shoulder and the right growing towards her right shoulder. Just before they reach her shoulders though they curl again, upwards this time. When they stop growing, each of her two horns forms a half circle on the left and right side of her head.
When she’s done orgasming, Miryam leans forward and lets her head hang forward.
“That … was amazing.” She sighs.
You smile and say, “I’m glad it was great for you too.”
Myriam giggles and says, “I’m sorry. I was so focused on myself that I forgot how it felt for you.”
“It’s fine.” You shrug. “I orgasmed as well. Pretty much a good sign I liked it.”
“Alright.”