Switch to Rosa

Not wanting to cum just yet, you told Lucia to stop, praised her for her good work, and had her switch places with Rosa. As she kneels in front of you, the light from the candles illuminates a small trail of fluid running from Rosa's labia down her thigh.

"It looks like someone enjoyed what they saw." You said, gesturing to the wetness dripping from her.

"It was so hot, Master. I hope that I can serve you just as well!" She replied.

"Only time will tell," you said, "but first you have to speak your commitment."

"John," She began. "This has all been such a crazy ride since that dinner invitation. I haven't felt this excited and nervous about something since I lost my virginity! I've always trusted my sister in her life decisions, and seeing how trusting she is of you helps me have that same trust. And so, I will be yours to have, to command, and to use. I will become an instrument for your pleasure, and will seek joy in your fulfillment. Please accept me as your whore, and show me my place."

Mimicking her sister, Rosa opened her mouth and waited for you to act. Likewise, you wasted no time in grabbing her head and shoving her mouth around your cock. Apparently, she wasn't as practiced as her sister was, since she immediately started gagging and allowed her hands to reflexively leave her thighs. You pulled her head off of your dick so that she could breathe. She drew in deep breaths while looking into your eyes.

"Slut," You said without breaking eye contact with Rosa. "Grab some cuffs from the bedroom. It looks like whore, here will need some help suppressing her reflexes."

Lucia returned quickly with the handcuffs and put them on her sister. Now with her hands tied behind her back, you shoved Rosa back onto your dick, using her throat as a fleshlight. The sounds of gagging were like music to your ears. For the next step, you decided to take a different route. Since Rosa trusted Lucia so much, you figured it was time to get her involved.

"Slut, why don't you help your sister fuck her mouth on my cock for a bit? And don't take it easy on her. Remember that she 'likes it rougher than you' after all."

Without question, Lucia knelt behind her sister, grabbed two handfuls of hair, and started forcing her sister's mouth up and down your cock while looking you in the eyes and biting her lip.

"How does she feel Master?" she encouraged you, "Does this whore's throat please you?"

"Ungh!" You groaned, "It definitely does when you're in charge of her!"

Lucia shoved Rosa's head all the way down so that her lips were at the base of your cock and held her there as Rosa gagged, exploding spit out of the side of her mouth and down her chin. Lucia reached a hand down and stuck a finger in her sister's pussy before pulling it out and holding it up for you to see.

"The whore must really be loving this," she said with a hint of surprise. "Look at how wet she is!"

Lucia licked her finger clean before finally allowing her sister to come up for air. Rosa inhaled sharply and deeply as strings of spit dangled between your cock and her face.

"Well done both of you." You said, shifting your focus between the two thoroughly used faces. "Now the only thing left is for me to decide where to cum!"