She's been touching herself

As you turn to look at Mia kneeling on the ground you see that she has one hand rubbing her pussy and the other groping her own tit. You didn't realise but she'd been masturbating the entire time she was watching her sister being whipped.

"Jesus, were you really getting off to that whore?"

Mia turns to you but doesn't stop pleasuring herself. "Please punish me daddy. I've been such a naughty little whore."

Mia seems just as surprised as you at how aroused she is by this whole display. You move over to her and grab her by the hair, dragging her up to the cross and lifting her into position. The entire time she doesn't stop pleasuring herself. Even once you've locked both legs in and her other arm, she still won't stop furiously rubbing her clit. You have to grab her wrist and forcefully move it up to the final restraint. You then grab the same ball gag and put it in Mia's mouth. It's still covered in Tracy's slobber. You then grab the bucket of clothes pegs and proceed to apply the entire rest of the bucket to her body, not bothering to put them in a neat formation like you did with Tracy but rather covering as much of Mia as you can since she seems so into this.

Mia's eyes roll into the back of her head as you attach the final peg directly to her clit and then move over to the table to grab a whip. Showing no mercy to this pain-loving whore, you start whipping her hard, sending clothes pegs flying through the air. Mia squirms out of instinct but moans through her gag like a whore as she seems to find immense pleasure in this punishment.

After a short while and no protest from Mia, you've removed almost all of the clothes pegs, with some still remaining in random spots across her body. You haven't been counting, but you're confident that you've already passed Tracy's record for the number of whips. Mia seems to be in some sort of a trance, finding a whole new type of pleasure as you mercilessly turn her body pink by whipping it all over.

"Alright whore, you've passed Tracy's record, you've won the trial. We can stop now."

Mia snaps out of whatever stupor she's in and looks you in the eye before shaking her head frantically.

"You want me to keep going?"

Mia nods desparately. You're honestly pretty tired from all the whipping, but want to continue to explore this side of Mia.

"Alright whore, we'll keep going then."

You swap out your whip for the flogger and start precisely targetting the remaining pegs. Mia is back in her pleasure filled daze as you continue flogging her body, even after you've removed the ridiculous number of pegs from her body. Deciding you'd like to test her limits, you start targeting her pussy specifically. Mia's squeals heighten, but there's still no signs of struggle from her, only pleasure.

After a number of hard whips to her clit, something you never would have expected happens. Mia starts squirting like a fountain, her pussy spasming from the immense pleasure and pain.

She looks to the ceiling of the basement and starts making strange sounds as she squeals into her gag. After repeating the same muffled noise a few times, you realise she's trying to scream out "I live to serve!" not wanting to make the same mistake she did earlier.

As she comes down from her orgasmic bliss, her head hangs down limp, with her chin touching her chest. You think maybe she's passed out, but when you get closer to her and lift her chin, you see that she's still conscious and is trying to say something into her gag. Her eyes are half closed as if she were returning from a night of drinking. You remove her ball gag to reveal what she's trying to say.

As you do, she repeatedly whispers "Thank you daddy. Thank you daddy. Thank you daddy." Still not able to make eye contact with you.

You first undo her leg restraints and then when you unshackle her arms, she collapses onto you. You slowly lower her to the ground to lie next to her sister. Both of their bodies are bright pink, although Mia's even more so, as they lie there and recover from their punishments, although Mia didn't seem to find it to be much of a punishment at all.