Cassidy is pulled a little deeper into the web

You watch Cassidy apply the lipstick with no small amount of satisfaction. Just the sight of that shade on her lips helps speed your cock to full, throbbing erection. It's a specific color that Carrie only ever wears for sloppy deepthroating, so when you see it you can't help but get excited.

There's also a certain twisted pleasure you get from knowing the lips being painted for your satisfaction are none other than those of your girlfriend's sister. It turns you on to know your girlfriend sent her to you knowing this would happen.

The snap of the lipstick cap going back on signals she's ready. She hands the lipstick back to you but then pauses.

You cup the back of her neck firmly with one hand. "Hey, no backing out now. You put on the lipstick, that makes you my whore. This was your idea."

After another beat, you soften your voice to a friendly, conspiratorial tone and stroke her head gently. "Hey. Relax. We're all friends here. It's just a blowjob."

She relaxes slightly and flashes you a shy little smile. She reaches for your waistband to finally free your cock. Once it springs free she gasps and looks up at you, wrapping her fingers around the shaft appreciatively. "Holy shit."

Your cock is a full nine inches erect. She can barely get her fingers around it at the base. "That's right; can you handle it? Tell you what. Just for making it this far you can spend the night here even if you give terrible head, but you'll be sleeping on the couch. But if you do a good job right now, I'll let you move into the spare room."

You notice Carrie watching from the open doorway, grinning at you. She's totally into all of this, the crazy woman. But you can't deny it's super hot. Sisters. Smoking sexy ones. Carrie is already wrapped around your dick, figuratively speaking, and it seems it won't be long before Cassidy joins her in your little harem.

You look down at the younger sister. She's almost painfully beautiful with that impossibly sweet look to her features. She's kneeling in a tee shirt and panties, nothing else. You decide to press your advantage since you hold all the cards anyway.

"And take off your shirt. If you're going to live here, you need to follow the rules. Girls wear lingerie only unless we're entertaining guests."

Carrie takes the hint and strips down to her own bra and panties.

She gapes. "You can't be serious... this wasn't... but Carrie..."

Carrie pipes up from the doorway. "Carrie was entertaining guests when you showed up. But now that you're going to be a roommate, you're not guests. So off come the clothes. It's the rules, sis. Come on, do you really want to call Mom?"

Cassidy groans but peels off the shirt, revealing a very pretty blue lacy bra underneath. It doesn't match the panties, but you're sure she'll put more effort into her lingerie moving forward.

You wave your hand. "Enough already. Cassidy, it's time. Are you a whore or are you homeless?"

Carrie's mouth popped open excitedly as she watched her little sister nod gravely and then part her lips to kiss and lick your cock.

"Good girl," you say, and beckon to Carrie to join you on the couch.