Your contact name always seemed to appear on his phone when he needed you most. It almost was like a second sense to you, as he always said. Tonight, Sam really needed to hear your voice.
You were back home, miles away from him finishing grad school to get into your dream work-field. Sam couldn't have been more proud of you---maybe a little envious, but he would never let his jealousy get in the way of what he had with you.
He was out on a case with his brother, dealing with apparent killer clowns---to which he was NOT excited for. You didn't know about his fear of them, & he had no intention of you finding out yet out of pure embarrassment. He knew you wouldn't laugh at him, but he didn't want to take the risk of having you & Dean teasing him about it. He's heard enough of it today already.
He missed you terribly, wishing you were by his side helping him out, but he didn't want to take you out of school for it. He wanted you to have a life outside of hunting, even if that mean't he couldn't. But, if you were happy, & safe, that's all that mattered to him.
He picked up his phone, hitting the 'answer' button, a smile growing on his lips.
"I swear, you always seem to call when I miss you," He chuckles, sitting back in his seat, relaxing slightly, "Are you sure you're not a witch?"