Bill's expression went from rogue to utterly naughty for a moment, his eyes meeting hers despite wanting to look lower. It was obvious for a second what he'd been like when he was younger, before responsibility had completely taken him over. It was still there, if you looked and gave it opportunity, but opportunity was so rare anymore.
"Completely and totally optional," he replied, pulling his own shirt over his head and tossing it over onto the sand.