I don't think you owe her anything but it sucks because she seems hurt. She probably made a bad decision here because it sounds like she's been into you for a while and just got the guts to go crazy. Now she's hoping though it was a crazy drunken sex thing, that you may have feelings for her too and will now feel free to come out and say so. Which is obviously not the case.
I think it does matter who the person is. If it's a stranger, obviously they can't expect anything from you except maybe a little gratitude and a minimum of politeness. With a friend or acquaintance, it's a little sketchier because if you want to maintain the friendship, it's important to do what is necessary to stay on good terms (unless it goes beyond what you're willing to do for them, for example if they want you to sleep over after and cuddle, that may be a good moment to be straight with them and say 'hey this was great and I love your company, but don't get me wrong, I don't think I want anything further than this').
But it's not just about them being a stranger or someone you know. It's what you know about them and what you have been able to gather from them about what their intentions are with you. If you're with a stranger but they seem all dreamy eyed and romantic toward you even if they just met you, then you'd probably do best to walk away from the one night stand scenario because the ensuing mess won't be worth it.
So, back to Karen. She is your friend in some capacity. It could have just been a one night, drunken sex thing. But here's the catch - she made a point of telling you, in no uncertain terms and in private, that she's into you and has been for a while, when she said "you're the whole reason I came in here and I'm not leaving disappointed."
I don't think this is your fault but it's probably going to change things between you. If it were me, I would probably have walked away from the offer, just because of what she said. Sex always changes something, however small, and it's usually best to make sure you are clear of what the consequences are.
What will probably happen is she'll still be your friend, but less so. She'll avoid you more. She'll be colder. The mistake was essentially hers...having sex with someone you're sweet on hoping they will declare themselves to you is a pretty bad idea.
Another possible scenario is a little less miserable: she's not sweet on you but since you're friends and had sex she expected a little more caring after the fact. It could just be that. To her, courtesy after a one night stand is expected.
Good luck figuring it out.
__________________
Whether we write or speak or do but look
We are ever unapparent. What we are
Cannot be transfused into word or book.
Our soul from us is infinitely far.
However much we give our thoughts the will
To be our soul and gesture it abroad,
Our hearts are incommunicable still.
In what we show ourselves we are ignored.
The abyss from soul to soul cannot be bridged
By any skill of thought or trick of seeming.
Unto our very selves we are abridged
When we would utter to our thought our being.
We are our dreams of ourselves, souls by gleams,
And each to each other dreams of others' dreams.
Fernando Pessoa, 1918
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