Follow orders

No, you decide, it would be best to proceed without causing any potential headaches for yourself. The bit of pleasure you do give yourself is every so often you spank her in a manner that pulls her ass cheeks apart, so you can get occasional peeks at her pink asshole. You wonder if complimenting her anal cleanliness would be weird for her to hear?

At the fifteenth smack she starts to sob and clench onto the seat tighter. Her counting and thank yous become weaker. By time she reaches 20 they're a mere whimper and she starts to beg you to "please stop, Daddy" and tells you "I've learned my lesson." After you come down with the 24th slap on her now bright red ass she seems to break completely. Instead of counting she begs you in gasped breathes. "Please...Daddy...I can't take it...anymore. I'll be good...from now on....I'll do anything...you want...any...thing..."

Anything? There are so many things you want to ask her to do, but pretty much all of it would be in violation of the terms you've set with the blackmailer. Although the agreement was that you wouldn't touch her in any way other than spanking, so maybe there's a loophole?