Enquiry about the Stories

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I am looking for a story , can't remember where I read it 

Storyline goes as below

Brother visits his married sister,her husband is on tour, brother stays with her.
Sisters birthday is coming, he plans a surprise for her, goes for a trip , fulfills all her wishes.
Celebrate birthday at midnight.
Sister feels happy for what he does and allows to have sex with her

Please find the title or anyone has any link of the story

Searching for a long time