I'm looking for a manga I read before, but I can't remember the name. It's about a girl who's in love with her teacher. She confesses and he rejects her. Then (I may be skipping something here) she offers herself to a random stranger and he turns out to be her teacher's younger brother. And they both end up falling for her.

I'm posting this here because I'm pretty sure it was a smut manga.

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Yes that's it. Thanks