The Muscle Girl

He challenged Kathy because he wanted sex with her. Badly. Ken had had a fetish for female body builders all his life. He lived with one named Jasmine for a few years, prior to joining the Amazonia Boxing Club.
Of course Kathy accepted the match knowing it would be over before it began. She actually thought Ken was attractive and heard chatter in the women's locker room about how good he was in bed. But Kathy held back from falling in love.

They came out at the bell. When Ken was close enough, Kathy unleashed two piston-like punches on the end of his chin, putting him out cold before Ken landed at Kathy's feet. He slumbered contentedly through the ten count.
A powerful rush overcame Kathy when she looked at the prone fighter, smiling up at her.
"God! Yes!" she shouted to herself, slamming her boxing gloves together.

They fucked all night at Ken's townhouse. Kathy was so happy the next morning that she almost didn't punch her lover's lights out.  As she dressed, Kathy looked at Ken sprawled on the bed, thinking how cute he was. She admitted to herself that she loved Ken and lay down next to him.

Photo from Luvsfemboxers