She pleads to no avail.

"Come on Melanie. I'm exhausted and still recovering. I just want to go tan downstairs."

"Well, I should probably go track down your brother then..." Melanie threatens

"Please don't Mel. You know he's off limits until he fucks me." Lexi begs. "He's mine first, and I already agreed to share after. Can't you just finish yourself up, I promise to let you be the first to know if we ever do it..."

"Alright, fine. But just give me a little strip-tease first." Melanie agrees. "I need something to get off to."

"Okay, I guess I can do that." Lexi drops her bottoms then stands between Melanie's open legs.. She then flips her hair over her breasts and releases her top.

You risk being discovered to search for your phone in your pile of clothes. You pull it out, undetected by Melanie, surely heard by Lexi. You start taking pics of the girls.

"Lexi, please do that thing your good at." Melanie starts to rub Lexi's nipples.

"Mel! I already said no. Now stop it..." Clearly embarrassed knowing your watching.

"C'mon Lex, I can already tell you want it. now go down on me..." She reaches for your sister's pussy "I'll return the favor..." She slides her fingers across your sisters slit, stopping at her clit.

Lexi gives out a little moan. Melanie continues, Lexi unable to deny her pleasuring, but equally unable to accept. Melanie then changes her position on the bed She lies on her back, head just inches away from Lexi's sex. Lexi's legs give away a tremble. "Your whole body is screaming yes Lexi. Just sit on my face, we can sixty-nine and both finish happy." Lex mindlessly complies. She hovers her pussy over Melanie's eager mouth. Once she got close enough, Melanie started going at it. Lexi then bent over and started to reciprocate the action to Melanie's honey pot.

You notice Melanie is fervently working away to get your sister off. Lexi dripping bits of moisture onto her face. Melanie stays focused and keeps her eyes closed to keep them out of her eyes. Lexi's legs are tightly wrapped around Melanie's head. Testing her hearing you knock on the closet door. She doesn't react. Lexi, shocked looks at you in the closet, giving you a look that said, "What the hell are you doing?" You step out of the closet, phone behind your back. Lexi looks even more upset.

Wanting Lexi to continue Melanie stops and says, "Don't stop, keep going." Lexi had to continue else let Melanie find you both out. You then start taking close-up photo's catching every detail of the girls going at each other. You pause when close to Lexi's open, wet pussy. Acutely aware of your raging hard-on your tempted to fuck her now, but that would immediately give you two up to Melanie. You could also disappoint your sister and surprise fuck Melanie or you could just slip out now and sneak away downstairs.