"Mel called us."

"Mel called us," Diddy explains.

"Yeah, we thought that she had butt-dialed us or something, but then we heard what was going on," Justine adds, "We were just sun-bathing, but this sounded like more fun."

Lexi gives Melanie a strange look.

"Guilty. I didn't want to leave them out, so I let them hear what was going on," Mel says.

"She just texted us to come in a minute ago, so here we are," Diddy says.

"How was your first time with the forbidden fruit, Lex," Justine asks.

"Amazing. I...just didn't think that it would lead to this...at least not so soon."

It is now your turn to give Lexi a strange look.

"When we find a good man, we share him," your step-sister explains, "It is just not usually so soon."

"Oh...," you say, finding no other words.

"That's what they usually say," Diddy says with a smile, "If even that much."

"It's alright," Justine says, "We know how to keep things going."

The two turn towards each other and start to make out. They put on a little show for the three of you. They are moving and shaking more than they probably would normally. This causes their boobs- large Cs for Diddy and large Ds for Justine- to rub back and forth. This is, obviously, no accident.

The show escalates even more when Lexi and Melanie decide to join them. They walk past you, beckoning for you to watch what happens next.

They each pick a girl- Diddy with Lexi and Justine with Mel- and rub against the back of them as they make-out. They move down their bodies and reach around the front. When they get low enough, the start to pull down their respective girl's shorts. The bikini bottoms are next, sliding slowly down just to tease you.

The four of them finish and separate, allowing Diddy and Justine to kick away their no longer necessary clothes. They stand before you naked, loving the fact that you are eyeing them over.

"It sounded like he's seen you two work on each other," Justine says, "So how about you two work on us? When we're ready, he can pick one of us to fuck next."

"Sounds good to me," Melanie says, "Lexi?"

"Well...as long as it keeps this going, okay."

The duo get on their knees in front of their respective girl and start to lick their pussies! You watch Diddy and Justine moan happily. This is obviously not even close to the first time that this has happened!

The naked pair just stare straight ahead at you, while lowering their hands in unison to rub their partner's heads to show their appreciation.

"Your sister has a nice, smooth tongue and knows how to use it," Diddy says.

"Melanie's tongue is long and quite limber," Justine says, "Of course, you already know that."

With their free hands, Diddy and Justine start to rub their own breasts, never breaking eye contact with you.

You just keep watching and slowly rub your cock at the same time. The girls just smile.

After only a few more minutes, both girls are clearly about to cum. They turn to each other and start to kiss. You can hear the sounds of their orgasms escape their locked lips!

When they finish, they break the kiss and help their partners to their feet. The girls share a quick kiss and then turn to you.

"Alright- time to fuck one of these lucky ladies," Lexi says, "Who do you want first?"