you used to be with dean for a few years a while back but ended up breaking up. skip some time and you ended up catching up with both sam and dean when you cross paths on a hunt you were on with your friend and all ended up working together. things were still awkward with dean but you and sam were still good, so you spoke mostly to him. after being with sam so much, you start to notice you see him differently and think about him way more than you used to.
you were alone with sam in the motel while dean and your friend went out to grab some food. one thing leads to another and you and sam end up kissing! when you heard deans car pull in the parking lot, you both immediately stepped away and tried to act natural, but ended up just seeming off. dean and your friend come back in with the food and immediately notice the awkwardness in the air as you and sam stood a few feet away from each other trying to act normal.