Let's start

I walk around the bed for about a minute, just to tease Ava more and more. I can see her wrists pulling on the belt and she tries to turn herself onto her side, but my hand on her lower back stops her.

Fuck me already!

Is that all you want? Just a good fucking and I leave? No, that's too easy. I raise my hand and smack her right ass cheek hard. Avas entire body jerks since she didn't expect that.

You've been a bad girl today Ava. Bad girls don't get what they want, they get a punishment. I smack her again before I kneel behind her. I pull her hip against mine, so that she can feel my hard dick through my pants. You want me to fuck you senseless, until you can climax no more, but that's not what you will get today. I smack her again, changing sides every time.

Please daddy, fuck me. I will be a good girl tonight. I chuckle.

You haven't been a good girl a day in your life, so don't try to fool me now. I squirt some lube between her asscheeks and spread it out a bit before two fingers push into her already dripping wet pussy. Her gasp changes to a loud moan instantly as my fingers curl up and hit her gspot. I keep running my fingerstips over it until I just start to finger fuck her close to her orgasm before pulling out both fingers. Her protest is met with a even harder spanks than before.

You've presented yourself on a silver platter for me and I appreciate that... but that doesn't change the fact that I won't give you the satisfaction of an orgasm tonight.
The two fingers, that were just curling up inside her pussy start to play with her even tighter asshole. I am not sure if Ava or Luna is tighter. At one point I will have them side by side for comparison.

I hate you!

I laugh. I wouldn't say that if I was in your position. I reach for the buttplug and rub it against her tight hole. I can see her hip pushing backwards greeting the cold metal plug as she shivers and the plug enters her. Now it's time for my fun.