"Nah I dunno. A true badass wouldn't try and argue percentages with the girl that'll actually be doing all the drinking, nor would he try and take away the means of her winning said bet. Nor would he ever admit to serving an eighteen year old. So Sixty Fourty. You get ten percent for being amusing with your trying"
Claire knew it was potentially a very bad plan to tease a vampire, But it was Spike. And what was he gonna do bite her and her superblood. Kill her? Nah. She was safe with him and she knew it, and she suspected he knew she knew it.
He'd miss the whining. He really would.
"Its a good offer Spike"
Of course there was the rest, the threat to tell Nathan, who would never believe him over her anyway. The threat to kick her out which would loose him his potential fourty percent.
She totally had him. And finished off her drink purely so she could thump the glass back on the table with satisfaction.