With Fervor.

Star seems to be pondering her option for about a minute, then replies.

"I'll do whatever you want, Mistress."
"I'm happy to hear it," Melissa says, "Bring her over here."

You realize that she's adressing you, so you give Star's leash a little tug and she starts to crawl over to the bed. Once she's there, her mistress taps her lightly on the head to show that she's pleased.

"I assume you have some tools that I can use here," she says to you, "We can use our hands, but that starts to wear a girl out faster than a whip."
"I'll see what I have around."

You walk back to the black bag and find a couple things that can work for this situation. There's a basic leather flogger as well as a thin switch that is good for leaving red marks on one's cheeks. The stuff doesn't look too worn. This obviously is part of the reason that Katie set this whole thing up.

With both items in your hands, you head back to the underwear-clad Melissa and the nude, leash-wearing form of Star. You present both items to Katie's tormenter using your two hands.

"Hmmm, nice stuff. Pretty fresh too. Did you buy this?"
"Heh. I wish," you reply, "That honor belongs to our mutual playmate, Katie."
"Re-ally," Melissa says, "Interesting. Is that true?"
"....Yes," Katie mutters.
"Answer me properly!"
"...Yes, I bought them both."
"You have an eye for quality," her mistress replies, "I guess that means you get to choose which one you want first. There's...the Flogger."

Katie is caught off-guard by Melissa's sudden action. She grabs the whipping implement from my hand and brings it down along her naked back.

"Ow!"
"Did that really hurt," Star asks with a hint of concern.
"Nonsense," Melissa replies, "She loves it. Although....not as much as this."

With her free hand, she grabs the switch from my hand and smacks Katie hard across the center of her ass.

"Yow!"
"We're not falling for it. Are we?"
"No," you answer quickly.
"O-of course not," Star says half-heartedly
"Oh, come now, Slut, you know that this was her idea. Let me show you how much it doesn't hurt."

Star flinches in response to Melissa raising the flogger into the air and bringing it down across her own back. With a smacking sound, the young woman feels a sharp sensation where she was hit.

"Ow....that hurt."
"Now, now," Melissa says, "You know that deep down you like it. Give it a second to make your back tingle."
"I don't know what you....oh, I feel it now."
"Isn't that nice?"
"Y-yes, it is," Star answers.
"I told you. Shall I try the other one on you too?"
"...Please do."

With the young submissive's request, her mistress takes a step back and pushes lightly on Star's back. This forces her ass up into the air, which was clearly the intent.

A flick of the wrist sends the switch towards the woman's tight ass. A light red welt shows up in a matter of seconds.

"Well?"
"I-I like it," her Slut answers.
"Good. You'll get more of that later...if you're good."
"Yes, Mistress."
"Very nice. Now, I believe I'm owed an aswer from my other ****."
"Please use...the flogger on me," Katie replies.
"That's better. Now, you have to take ten strokes before you get any other kind of contact. Watch how it's done, Slut. For every weak stroke, it's one more minute before you get to touch me in any way. Got me?"
"I understand, Mistress," Star answers with an obedient tone.
"Good. Now, count them out as I go."

The first swing is softer than the testing stroke given mere moments ago.

"One."

The second one is harder, but not something she can't handle.

"Two."

The third is a little harder and comes sooner.

"Three."

Mixing things up, the next three are very hard and fast.

"Four. Fi-ive. Six!"

The seventh and eighth ones are slower, but are harder still.

"Seven! E-Eight!"

The ninth one is as light as the first one- just to mess with her.

"Nine!"
"This one is really going to hurt, but it will get you a good reward."

As she promised, this is the hardest one yet. It' a real test for Katie.

"T-t-ten!"
"Good girl," Melissa says, setting the flogger down, "You didn't let me down."
"T-thank you, Mistress," Katie answers.

You're a bit suprised by her 'change-of-heart,' but quite happy to hear it.

"What does she get," Star asks curiously.
"Why tell you, when I can show you?"