Author's note: This story takes place during Thor, but is an AU with Sif ending up on Earth instead of Thor.
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Jane Foster didn't like women. More accurately women didn't like her, called her names and gossiped about her behind her back, but she was getting off topic. The point was she wasn't sexually attracted to women... or at least she hadn't been until Darcy Lewis bulldozed her way into her life. Then Jane started having these thoughts, but she thought if she was gay or bisexual she would have known before now, so it must be some kind of fluke.
Then her van crashed into a woman only to become scrap metal upon impact, the mysterious woman effortlessly carrying herself and her assistant out of the wreckage and giving them some weird herbs to eat before picking them up again and carrying them to their crappy apartment building.
"I'm sorry we hit you." Jane whispered lamely as the woman carried her to her bed.
Sif smiled, "Like I said, it is I who owe you the apology Lady Jane. My timing was unfortunate, but I think I know how I can make it up to you."
"How?" Jane asked out of curiosity, still confused what was going on.
Then Jane blushed furiously as Sif cupped her cheek and softly spoke again, "Some time ago an enchantress named Lorelai cast a spell on me. It was meant as a punishment, revenge for imprisoning her for her crimes, by turning me into an abomination like her, but worse. See, she is irresistible to men, while she made me equally irresistible to women. Such a thing in my world is often considered deviant behaviour, and at first I was furious. But, over time, I came to adore the effect I have on my gender, and have become highly efficient at pleasing the women who flock to me. I now wish to please you, Lady Jane."
Jane's head was spinning. Sif had been talking about 'her world' for the better part of an hour, which was all the time it took for this exotic creature to get them out of the desert and safely back home, yet despite the impossible incident with the van Jane still wasn't sure what to believe.
She never liked jumping to conclusions, even when there was significant evidence placed in front of her that suggested there was no other conclusion, and yet she couldn't deny Sif's words. To do so seem disrespectful to this... this goddess. Besides, Jane could barely stop herself from reaching up and pressing her lips to the other woman's, and not in the casual way she had felt when she had first met Darcy, but the way she felt being around her assistant now she'd had time to fall for the curvaceous woman.
Her desire was such that Jane closed her eyes the second Sif lowered her head downwards, however instead of simply kissing her the stronger woman whispered, "Before we start, it may comfort you to know that if I am convinced a woman is only interested in me thanks to Lorelai's magic I'll let her go. That is very rare as most of the women I meet have at least a passing desire for their own gender, and I'd wager you have much more than a little curiosity given the way you look at Lady Darcy, and the way she looks at you. Tell me Lady Jane, are the two of you together, or are you resisting your desires as so many women do?"
Taken aback at the question Jane blushed, and then stammered, "D, Darcy is my intern, and my friend, I... I could never..."
"As I suspected." Sif smiled softly, stroking Jane's face, "Don't worry my lady, I will ensure that the two of you become lovers. But first, I would have you both."
Jane opened her mouth to protest, or at least she thought she did. Honestly when Sif pressed her lips to hers things became a little foggy, her brilliant mind clouded and she became overwhelmed by being kissed by another woman.
Overwhelmed how soft it was, how good it felt, how despite the opening Sif didn't try sticking her tongue down her throat like so many of the men she had dated or at least gone on a one-off date with. This was so much better than that. This was better than almost anything Jane had ever experienced before, and it only got better when Sif finally added her tongue to the mix.
As Sif gently brushed the astrophysicist's lips with her tongue and then pushed it inside the other brunette's mouth Jane found herself wondering if all women kissed this way. If Darcy kissed this way. Actually, after getting to know the girl Jane guessed that Darcy would be more like her ex-boyfriends.
Forceful right from the start, and so very sloppy. Somehow that appealed more when Jane thought of Darcy doing it. Then Jane was awoken from her thoughts by Sif breaking the kiss, the brilliant brunette letting out an embarrassing whimper as she wondered what she could have done to displease this goddess of a woman.
Of course that wasn't the case, Sif gently caressing her face and softly telling her, "If we have sex, I guarantee you it will be the most satisfying experience of your life. However, you will be mine forever. Even if I leave you here you will ache for me, and if I allow you to become part of my collection then the days I don't touch you will be even worse. You will become a slave to your innermost desires, and in time you will beg to be collared and branded, your body becoming nothing but a toy for me to play with whenever I want. Is that what you truly want Jane Foster? Do you wish to become my slave?"
It was absurd. On some level Jane understood it was absurd, but in that moment she couldn't bear to say anything but, "Yes."
Sif smiled, "Let me know if you change your mind. In the meantime, you will refer to me as Mistress. Anything else, or forgetting to do so, will result in punishment. Do you understand?"
"Yes Mistress." Jane replied without hesitation.
"Good. Very good my little pet." Sif smiled softly before closing the gap between them once again.
As this was Jane's first time with a woman Sif kissed her for a very long time, the warrior woman gently resting herself on top of her prey as they both clearly enjoyed this sign of affection. Then again, Sif had always enjoyed kissing, and she had quickly grown to prefer kissing women to men.
Lorelai's sorcery no doubt had a hand in that, but as she felt Jane's soft lips, and soft body in general, pressed against her own Sif wondered why it had taken a spell to make her realise that, at least for her, women made superior mates.
It was not the first time she had thought such a thing, nor would it likely be the last, but this was not the time to wonder such a mystery. This was the time to concentrate on her latest conquest, the perfect porcelain doll which was Jane Foster, the little human who was now kissing her back without any of the nervousness of the initial kiss.
True, Jane was not the greatest kisser, but she did a pretty good job at massaging Sif's tongue with both her mouth and her own tongue, and she helpfully lifted herself up when necessary to make it easy for Sif to remove her clothing. Sif had found in the past if a first timer was nervous, like Jane clearly was, leaving their underwear on was a good way to relax them, which Sif did. Partly.
Jane's panties stayed where they were, but Sif removed everything else, including the other brunette's bra, allowing the warrior woman to gently play with the cute little handful Jane had to offer while moving her lips to the scientist's neck.
To Sif's delight Jane immediately started moaning and whimpering at her touch, which in turn pushed Sif to begin sucking as well as kissing her neck while she cupped those perky little boobs, her fingers teasing Jane's nipples to hardness before her mouth even got anywhere near them. Not that Sif was able to resist them for very long after that.
Sure enough Sif soon began the inevitable descent on her prey's body, kissing her way down Jane's chest until she could slide her lips up the scientist's right boob and take one of her nipples into her mouth. Sif sucked gently at first, but she couldn't resist swiping her tongue over it before she kissed her way down that breast, kissed her way up the other and gave Jane's left nipple the same treatment.
She then went back and forth between those tits, Jane clutching the sheets and whimpering adorably as Sif enjoyed her prize. Although if she was truthful with herself the entire time Sif was mindful of the real prize waiting for her between Jane's legs.
Jane couldn't believe this was happening. She wasn't the kind of girl who would just sleep with a man the moment after she met him. She'd only had sex with three guys, all of which she had dated for a long time before finally allowing them to flop around on top of her.
This was nothing like that though. This was literally something out of this world. A woman from another world, and if her sexy accent was any indication, from another time too. Or at least from a world somehow more advanced than Jane's yet with some very primitive thinking, which was fascinating, although Jane was far too preoccupied with what Sif was doing to her to dwell on it. Too overwhelmed by the fact that she was having sex with an alien.
Even though she would never admit it under any circumstances Jane had fantasised about being slowly seduced by a humanoid lifeform. Some musclebound creature who slowly romanced her and then took her hard and rough when she was ready.
Somehow she had never combined that with her occasional fantasies of being with another woman, and now it was happening Jane couldn't believe she hadn't considered it. Then again maybe it was better that she hadn't, because while she had an active imagination she could have never done justice to this image.