She stays in her room

If Sister Anne were to go for a walk, there is a chance of her walking up to that damned mirror again. Last time she looked into it, it sucked her in. She has no desire to go through that again. The whole experience left her shaken. She has never been with a man before. Not even as a casual friend. Then because of that mirror she was suddenly in the nude with one. And the pounding. It was so forceful. Filled her with … she doesn’t even know how to describe it. She didn’t even dare think of what might have happened if she … finished.

As sister Anne is thinking all of this, she looks outside her window. The night sky is clouded, leaving it darker than usual. It is so dark out there that she can see her reflection in the mirror. While she is lost in thought; the reflection in the window changes into the image of a blonde woman dressed only in black panties and stockings. Her wrists are tied to a pole above her and behind her is a fully nude man. Sister Anne is too lost in thought to react. So, the next time she blinks her eyes, she finds herself in the position of the blonde woman.

“Wait. What happened?” Sister Anne asks as she looks around with a confused look on her face. Where is she not in her room any more? Where did her habit go? And why are her hands tied above her head? She must be in the mirror world again. Is she experiancing one of the blonde woman's memories? Or is she in her body?
She then feels two hands place themselves on her hips. As she turns her head to look behind, she sees the same man from last time she was pulled into the mirror. He brings his mouth close to her ear and whispers, “Enjoy.” Then she feels his dick slide into her pussy.

As Sister Anne feels her pussy stretch to accommodate his penis, she feels a surge of pleasure rush through her neither region. It is a feeling she remembers. One she has felt before.
Against her wishes, this feeling makes a groan escapes from Sister Anne’s mouth. She blushes from embarrassment. A sister like her should not be enjoying something sexual intercourse.
As he thrusts in her again another gasp escapes her.
She can’t help it. Her body just … reacts this way. It is betraying her. It’s out of her control.
Another thrust, another gasp.
Sister Anne tries to pull away, but her hands are stuck. She can’t escape.
This time the man digs his dick all the way into her and leaves it there for e few seconds before pulling out again. While he was in her, Sister Anne’s pussy reactively contracts around the invader, sending another wave of pleasure through her. Sister Anne closes her eyes and lets the wave flow through her, resulting in her professing her pleasure in a moan. All of the sudden, the Sister simply gives up.

She cannot escape for she is tied up. If she could escape, she is stuck in the mirror, so she cannot run. She cannot avoid this. She is trapped. So Sister Anne lets her head hang as her pussy takes a pounding. It starts slow but gradually goes faster. Over and over her pussy gets filled by a hot and hard dick, just to be left empty again and then filled with pleasure once more. And the buildup of pleasure is so slow. It frustrates her. At some point she even catches herself wishing either he or she would just climax already. And all the while her voice keeps reminding her, though gasps and moans, that her body is reveling in this sinful act. When the man suddenly pulls on her hair, her moans even become worse.

Not long after, Sister Anne’s feels her sinful wish come closer to completion. The orgasm she has so wrongfully been wanting is getting closer. Just a few more thrusts from him and she’ll finally know what an orgasm feels like. Just as Sister Anne feels like she is about to explode …

… she opens her eyes with a wide gasp and sees she is back in her room. She is not tied up any more, there is no nude man behind her. She is at her desk, sitting in her chair, fully dressed in her habit. Although for some reason her habit is pulled up to expose her hips and one of her hands is inside her panties. She pulls her hand out her underwear and finds her fingers glistening with juices. She brings them to her nose and takes a whiff at them. They smell like her vagina.

Sister Anne groans. Now she’s being pulled into whatever that was through the reflection in her window. Is there truly no safe place for her? Sister Anne quickly closes the curtains and hopes that is it. But despite having left the mirror-world, the desire for orgasm that build up in her from there has joined her here. Sister Anne looks at her smelly fingers again and a wrong thought forms to her mind. She may not have a man to bring her to an orgasm like in the mirror-world, but her fingers could do that job as well. Couldn’t they?