Incest Seduction/Lift Kim's towel
From Create Your Own Story
Since you're the one who's supposed to be in charge of the massage, decisions like these are your prerogative. It may not be 'necessary', but that's not going to stop you.
Grabbing the bottom edge of the towel, you lift it up into the air until you can see all of your sister's tight, firm ass. Kim lifts her head and looks back over her shoulder but she doesn't say anything. Gingerly folding the edge of the towel you lower it back down onto her butt. The folded edge now sits right across the middle of her bum, exposing the bottom half of her cheeks to the air. Like her thighs, her bum is pale and flawless. It looks just as nice now as it did in her yoga shorts.
"Ry," Kim says, before you can continue. "I think there's some grapeseed oil on my nightstand. If you want it," she adds, lowering her head onto her arms.
"Sure," you reply. Only a few paces away, you quickly survey a small collection of bottles and snatch up the oil she mentioned. It's in a clear squirt bottle and looks pretty runny. Where should you use this?