Hand them 500 coins.

You reach into your pocket and take out a few hundred coins, handing them over to Trisha.

"Here", you say. "I'm a rich man. I can afford some alms for girls who know how to address me properly."

You witness a blink of greed in Trisha's eyes as she takes the coins and quickly places them into a tiny bag dangling from her left wrist. "Thank you so much, Sir!", she purrs. "You are so kind, and we are unworthy little slaves!"

You nod. "That sounds right to me."

Both girls bow to you submissively. "You are very kind, Sir", Lana mumbles. "Please know that these slaves will be ready to serve you, if we make it to the other side of the door."

You smile. "I look forward to it."

As the twins turn around and walk away, you stare at their wonderful asses, content with yourself. You just wonder if you should not have asked for more right here, right now, on the spot.