Put Rosa through her paces

Since Rosa was the newest member of the household, you decided to take full advantage of her commitment as a sort of probationary period. The next day, you sat the sisters down and explained their temporary status changes. You explained that Rosa was to be treated as little more than a sexual object for both you and Lucia. Lucia would still serve you exactly as she has been, but she would now also be expected to use and **** her sister to the same extent that you would. You also gave Rosa some specific new instructions:

1) She was no longer allowed to wear any clothes under any circumstances.

2) She was only allowed to speak when directly spoken to.

3) While Lucia was still free to use more affectionate and informal names when addressing you, Rosa was restricted to only referring to you as "Master" and to Lucia as "Mistress".

You asked if Lucia had any rules that she would like to add. After thinking about it for a minute, she also decided to require her sister to take over all of the cleaning and cooking responsibilities, leaving Lucia free to enjoy herself and pleasure you more.

"Nice one!" you said to her with a wink and a smile.

Having made sure the sisters understood the new dynamic, you wasted no time in giving Rosa her first order.

"Alright, bitch, why don't you go and fix me a drink?" You said, shooing her away towards the kitchen.

"Of course, Master." She said and went to the kitchen.

While she made you a cocktail, you wrapped your arm around Lucia's waist and led her to the couch. You had mostly gotten used to her being naked 24/7 now, but you never truly got tired of having her body on display. Sitting down on the couch, you put on some slow music and instructed her to dance for you.

Rosa returned with your drink. As she went to hand it to you, you stopped her. "Present it to me like a good little bitch." You said, letting her figure out on her own what that meant. After thinking for a second, she knelt in front of you on both knees, lowered her head, and raised the cup in both hands.

"Your drink is ready, Master." She said.

"Much better!" You said, returning your gaze to your wife's dancing. "Since you're already down there, why don't you make yourself useful?"

This time, she didn't need to think about what you meant. She instantly pulled down your pants and underwear, freeing your growing erection. She took the tip in her mouth and began giving you a blowjob.

As the song ended and Lucia's dancing slowed, you silenty beckoned her over to you. You held each others' gaze as she sauntered over. Unprompted and without breaking eye contact, she pushed Rosa's head fully down the length of your shaft, eliciting a soft groan from you.

"Follow my lead, whore." she said as she straddled your legs, keeping Rosa's head between her pussy and your dick. Grabbing onto the back of the couch for balance, she started slowly grinding her hips back and forth, causing her sister's head to move up and down your dick in response. You knew your wife could be creative, but making her sister facefuck your dick by humping the back of her head was certainly unexpected!

You reached a hand up and started groping one of Lucia's tits while you took the other in your mouth. She closed her eyes and moaned in response. "Mmm, that feels so good, my love." She said softly, still grinding her hips against Rosa, but picking up the pace a bit. "I think I'm already getting close to cumming!"

Truthfully, she wasn't the only one. It was incredibly hot to see how she had immediately gotten so into the new dynamic, embracing her sister's role as an object for pleasure.

You reached behind her with both hands and squeezed her firm ass tightly, silently encouraging her to grind against her sister's head faster. Soon enough, Lucia's climax hit. As she let out a moan, she also pushed her hips fully foward and held herself there, causing Rosa to fully take in your length. Rosa struggled with the unexpected change, as her attempted cough sent saliva exploding out of the sides of her mouth and tears streaming from her eyes. You let out a loud groan as her throat spasmed against your cock, bringing you to the edge.

Lucia gave you a devious smile and pushed her hips as far forward as she could, shoving Rosa's nose into your pubes, and causing an even bigger convulsion in Rosa's throat. Ordinarily, the sensations alone would be enough to send you over the edge. That coupled with the fact that your wife was so enthusiastically using her sister as a toy to empty your ball sack left you no chance to hold out any longer. You let out a loud groan as you erupted directly into Rosa's throat.

As your orgasm subsided, Lucia finally released Rosa from the base of your cock. Rosa immediately began coughing and gasping for air, strands of spit and hanging between her lips and your crotch. Her face red and her hair was a tangled mess thanks to your wife.

"Well aren't you a sloppy little cunt?" said Lucia, wiping a heap of saliva from your dick with her hand and smearing it across Rosa's face.

"Yes, Mistress." Rosa responded in between breaths.

"Yes, Mistress, what?" Lucia replied.

"Yes, Mistress, I am a sloppy little cunt!" Rosa said, finally starting to catch her breath. "I'm a sloppy little cunt whose only use is to make my Master and Mistress cum!" It looked like Lucia wasn't the only one enthusiastic about the new dynamic. Rosa was clearly trying to be the best sex toy she could.