Champagne Wa Koi No Biyaku

Can one night lead to many more?
When tycoon Graydon Gallagher lends Rebecca a shoulder to cry on at her ex-fiance’s wedding, she doesn’t expect to wake up next to him the following day! Exactly what kind of comfort has he given her?!
From Baka-Updates:
Rebecca really is unfortunate. At first her fiancé gets stolen by her stepsister and then she even has to attend the wedding of those two. At the wedding tycoon Graydon Gallagher approaches and comforts her. The next morning she wakes up next to him and is not so sure what might have happened the evening before…
After that Gray proposes to take her on a business trip with him and Rebecca agrees, thinking it might be the starting point to a new life… plus Gray assures her that it will only be those two weeks and after that it will simply be just a memory, nothing more.