Hillary, your sister, is a gorgeous young girl with a strange disorder. Her skin is SO sensitive that she cannot wear clothes without horrible blisters developing on her skin. It's so sensitive that just touching her can make her scream... or cum.
You have dropped by for an afternoon visit, to find your poor sister crashed-out asleep on the table. She is forced to sleep here, as all fabrics make her skin burn. She wakes with surprise, and eases her aching, stinging body off of the table, gasping with pain and delight every time she moves. Her naked body is entirely too much for you.... it's so difficult to not get hard.
Then, she takes things to another level. She wants to play a game with you. What does this mean? Is she as turned-on as you are? Is she... pushing for intimacy? This is so wrong! But her breasts are so, so beautiful...
Succumb to temptation. Enjoy the bountiful delights in front of you. And just like Hillary does... feel EVERYTHING.