Give her a fetish

John looked at the woman.

"I really know why you think this is disgraceful," he told her.

"Oh, yeah tell me."

"You love the taste of your own ass. You are addicted to the taste of your own ass. You are so ashamed of this, you act like a prude in public, but you really love and crave the taste of your own ass. When you're alone and bored, you love to finger fuck your ass then suck your finger clean. When you're alone at night, you love fucking your ass with a vibrator then suck it clean after you orgasm."

The woman stares at you with her mouth open. Her face turns red.

John continues. "And you especially love the taste of your ass on a guy's cock mixed with his cum. Nothing in the world tastes better to you than your ass and a guy's cum mixed together."

The woman blushes and looks totally ashamed that her secret is out.

"You want me to fuck you up the ass right now, so you can suck me clean afterwards and then ream my cum out of your ass with your finger."

She just nods.

"Too bad, you pissed me off. Go find some stranger to fuck you up the ass then suck him off and ream his cum out of your ass. Do it in an alley as the more dingy and dirty the place you get ass-fucked, the more it turns you on."

The woman gets up, looking down in shame, grabs her purse and hurries off.

John watches her hurry off then he sees another woman, overdressed for the weather, come out of the coffee shop, take a seat and blow on her drink. She looks like another prudish type, but looks can be deceiving. She had thick brunette hair tied in a close bun on the back of her head.

"This could be interesting," John mused to himself.