On a 7-9, the sisters take their clothes off, if you turn them on

"Before we show you our bare skin, we need a little encouragement," Shasta says, her head wobbling from the grass.

"Yeah," her sister says, cuddling into Shasta's shoulder.

You start stroking your cock for them. "So if I stroke my cock, will you take your clothes off?" You get into it, sticking your tongue out as you work. You work it up and down, and then twist at the top around the mushroom head. The girls watch with rapt attention, their eyes following up and down as you stroke. "Don't you want to see what else this baby can do?" you say, encouraging them.

As one, the two sisters stand up and first Shasta pulls up her crop top over her head, showing you her nice handful tits, bare of any bra. Sarah takes off her tank top to reveal a lacy white bra. She unsnaps it and you lick your lips to see her full boobs on display. Both girls have fat nipples capping the ends of their gorgeous tits. The girls shake their chests at you, and then Sarah gets thrown off-balance by her bigger mounds and her state of inebriation. She reaches for Shasta to keep from falling and grabs her boob hard. Shasta moans loudly at the stimulation.

"Keep going, wanker boy!" Shasta says with her fingers in her waistband, ready to pull down. Sarah is still trying to get stable.

You give it a couple more strokes, and Shasta starts pulling her shorts down. She wiggles her hips, which makes her tits jiggle sweetly. She gets to her crotch and your realize that she's not wearing any panties. As she pulls further, you see she's not even wearing a thong. Sarah starts unzipping her walking shorts, and you have trouble going back and forth between the two lovely coeds.

They both drop their shorts to the deck and straighten up, posing like magazine models. Your eyes have trouble focusing because it looks like there are six or eight boobs in front of you. They move so much you can't keep track. You grab your head to keep it still, and with great effort the number of breasts slowly diminishes to four. Four perfect breasts. Goddamn, they are very sexy!