Sofia sat up and twisted her head back and forth. "I'm so stiff from doing homework. Do me a favor, and get on top of me and push the palms of your hands into my back, with as much force as you can."

"Like a massage?" Lisa asked sheepishly. Her heart sped up a little.

"Exactly," Sofia said, removing her t-shirt. Her breasts dangled freely, and Lisa saw that her nipples were indeed dark, almost black, about the size of store-bought chocolate cookies. She also had a belly button ring, and a ...