Twisted Hearts Entwined

I'm a twisted cripple who loves tormenting beauties.
The Grace family, eager to curry favor, sent me a sickly beauty as a husband.
The poor thing, frail and helpless, knelt by my wheelchair with tears in his eyes:
'Sir, please love me...'
For a while, I thought he was genuinely weak and sickly, so I pampered and protected him, even letting him take the dominant position.
Until later, when enemies attempted an assassination during a critical moment.
I stood up from my wheelchair and drew my blade to counterattack. He swung his fist, killing one with a single blow.
After dealing with the threat, we both casually flicked the blood from our hands...
And stared at each other in disbelief.