He grinned and turned around to face her, walking backwards rather gracefully for a man his size.
"Lucky for me," he said - and then all his smoothness vanished as he stumbled over a stack of books he hadn't yet put on the shelves. He just managed not to fall flat on his ass but his glasses ended up hanging off the tip of his nose.
He looked at her for a moment, flushing though it was hard to tell with his dark skin, then laughed.