A few ideas to think about...and talk about?
1He makes a mistake...she makes him pay.
2He makes more mistakes...and she makes him pay more.
3He is blackmailed and humiliated.
4She had her own way of 'Auditing' his returns.
She seized the opportunity...
1He played in the wrong place and the wrong time.
2He keeps his commitment and she tightens her grip.
She thrashed him, in every sense.
Lust at first sight; they share their perspectives.