Batgirl has been sent to be trained by the man that has trained all of his robin's.
She has been sent to not only brush up on her fighting techniques but to learn the hard facts about the differences in fight training and real street fighting.

its a rough lesson he can no longer bring himself to teach these y*ung partners and has instead sent them to a trusted trainer who can treat them as poorly as they need to be treated in order to learn the harsh lessons of the street without real danger.

Batgirl arrives cocky and arrogant, not knowing why she would need the services of a fat aging man who doesn't look like he could cr*ck open a bottle of soda let alone a skull.

Soon Batgirl learns the harsh lesson of judging a book by its fat,bald cover, and is eating the mat.
The fight is one sided for awhile until Batgirl catches her breath and returns the bl*ws. She is holding her own when the trainer starts to use tricks to trap her.

he makes her realize that out in the streets she is open prey and anything can happen.
She needs to be lucky overtime she faces a foe, they only need to get lucky once.
He humiliates her and suddenly her clothes are coming off. She has no idea why he is doing this and surely batman couldn't have agreed to this.
The s*xual aggression is over rather quickly as batgirl tries to trick the massive trainer but fails to get anywhere. He leaves her humiliated and battered,

"Go home to your bat l*ttle b*by Bat. You are worthless"
And batgirl is left to wonder how she will explain this to Batman.

Knebelgespräche B*ndage Gemischter Kampf Blonde Batgirls Failed Struggling Training mit C4s.com