Cue pheromone craziness!
"Oh, you, too," he answered, his hand reaching out to take Ethan's. Elliot couldn't put his finger on exactly what it was that felt odd about the handshake. Maybe his palms were just sweaty, but he almost felt like there was something rubbing off his hands. Hopefully they weren't too sweaty... or dirty. That was definitely unpleasant, shaking someone's filthy hand.
Realizing he was going off into his own thought processes, he quickly refocused. "Yeah. Running out of clothes, you know." The life of a college student: wait until the absolute last minute to do the laundry so that you can cram as many clothes as possible into one wash. If Ethan hadn't been here, he might have washed the shirt off his back.