Some of the confusion of the situation hits you and you diddle yourself a bit outside

You know that you should go inside... If it were you out here you'd be running back in. Fortunately, it's your sister... even if it is you. Well, you in your sister, so it's not really you or your sister out here....

Thinking about it makes your head hurt, and you sit on the latticed lounge chair, noticing as you do that there's a pair of sun glasses, some strong tanning oil, and one of those embarrassing romance novels that your mom loves.

It makes you cringe whenever you see your mom avidly reading a book which shows a half-naked couple on the cover, the two obviously moments away from torrid sex. Just thinking of the hunky beefcake plowing his sizable package into the tight juicy box of the buxom beauty makes you...

"Gah!" you cry out, flopping yourself face first onto the lounge chair as you realize your fingers had become buried in your new pussy. A very juicy pussy too, but the sizzle of the lounge's sun-heated wood on your tender breasts makes you yelp, breaking the spell of the evil book. What idiot thought it was a good idea to paint a lounge chair black in southern California? And what kind of a pervert is your sister to have a simple book cover make her pussy go into overdrive?

Grimacing you rub your tender breasts, and the nipples pop up instantly. It occurs to you that anyone looking at you would see a pretty young girl - make that a drop-dead sex goddess, you correct - fondling herself.

"Hmm, I bet that's something Sue would do..." you smirk, and reach for the oil.