Your Sister's Sister(2012)

A year after his brother's death, Jack is still emotionally fragile. When he makes a scene at a memorial party, Iris decides to intervene. She gets Jack to oil up his old bike and drive out to her father's cabin on an island on Puget Sound, where she hopes he will be able to work through things. When Jack arrives at the cabin, he does not find restorative solitude but instead Iris' sister Hannah, nursing a wounded heart and a bottle of tequila. After throwing back a few drinks, these two end up getting to know each other a little more intimately. Their hangover wake-up call arrives the next morning in the form of Iris with a bag of groceries in hand.