If you let me watch

"I won't tell Mom if you let me watch" Samantha says and steps into the room another step.

Alicia's mouth drops open and she hollers at her sister, "Samantha! You can NOT watch us!"

You grin to yourself; thinking it's kinda cute as you watch Alicia's face redden. She's already let you fuck her in a book store (where you're sure everyone heard you) and then brought you back to her parents' house where she's wanting to fuck some more - yet she's embarrassed now. Well, it is her sister though, after all.

You turn your attention back to the two teens as Samantha says, "Oh c'mon, Alicia! I'll just watch and I won't make a sound." She smiles and winks at you, "Well, maybe a little sound."

"No!" Alicia squeals; laughing a little in spite of herself. "It'd be... weird."

"Well, that's my offer - take it or leave it," Samantha says resolutely as she pulls her phone out of her back pocket and starts to dial a number.

"Okay, okay, okay!" Alicia shouts. "You win! You can watch us for a little while, I guess."

You smile; stroking your cock as you listen to the girls bargaining.

Samantha's eyes are on your cock and she grins as she puts her phone away and walks over to the side of the bed; pulling a swivel chair on rollers over from Alicia's desk. She looks at you as she sits down slowly and spreads her legs; putting one foot on the edge of the bed.

You grin and run the head of your cock along the inside of Alicia's thigh as you smear precum across her smooth skin. You look down at Alicia to see her looking over at Samantha.

You can't quite tell what the look on her face is, as she watches Samantha's hand slide over the crotch of her jeans; rubbing slowly as she in turn, watches Alicia and you. Alicia looks back up at you and you can see a slight look of uncertainty in her eyes.

You flash her a reassuring smile and you guide the head of your cock up her leg and across her warm pussy lips; making her gasp. A smile stretches across her face and she lets out a soft moan. Her little hand grabs hold of your cock and she jerks it as she keeps your cock pressed against her bare pussy.

You don't need any more encouragement and you lean your body over Alicia's more; pushing your hips to meet hers. You cock pushes right inside her warm, wet pussy and you feel her relax; letting you sink in all the way. You groan as you feel Alicia tighten herself around you as you're buried inside her.

Her little pussy hugs your cock; practically sucking you in deeper. Her inner walls tighten and start working your shaft as she begins rocking her hips under you; her eyes on yours as she brings her legs up; wrapping them around your waist.

You've completely forgotten about Samantha sitting there watching the two of you until you hear another moan. When you look over at her; you see that she's already undone her jeans and she has a hand thrust down the front of them. From the movement under her jeans and the look on her face; you can tell she's rubbing her pussy as she watches you.

You grunt at the sight and your hips start rocking faster; pushing yourself deeper into Alicia. Samantha's foot slips off the edge of the bed and it slides across the mattress and across Alicia's breast. You watch in surprise as Samantha rubs her little socked foot across her sister's bare tit; running right over her hard nipple.