It was finally my turn

My impossibly huge cock weighed heavily on my abdomen. Mom eyed it hungrily.

"Aww I'm sorry honey, I just couldn't help myself. Don't you like the result though?" she asked.

I looked down at the huge column of cock resting on my chest. I had to admit the subtle heat of the spongy flesh reaching all the way up to my upper sternum was pretty fucking arousing.

"Maybe.. but you're my Mom," I countered weakly.

Smiling, Mom kneeled down and crawled over between my knees. Her loose top did nothing to hide the impressive cleavage of her hanging ample breasts. I swallowed nervously.

"I know baby, but we're the only ones on this island. It would be a shame to let this go to waste! Don't you think?" she reassured softly, showing me the magical gem.

"Here, give me your hand." she instructed.

Wrapping my hand around hers and the gem, she placed our fists just above her heart. The warmth of her soft upper chest radiated through my palm.

"Think about that fantasy you told me about today. Wouldn't you like to see my breasts get.. massive?" she teased, squeezing her tits together with her elbows. The soft flesh bubbled deliciously, threatening to spill out of her top.

God, yes I would. My cock involuntarily pulsed at the idea of her pretty-but-modest rack getting an upgrade or two.

"I think that's a yes," Mom giggled, "Look right here and focus darling."
Mom moved our interlinked hands into the center of her hanging cleavage.

I obediently stared at my Mom's supple breasts, imagining them swelling into a pair of glorious watermelons. As my arousal increased, the tingling sensations emanating from the stone grew stronger. They radiated out of my hand and down my arm, connecting to a deep lustful energy that was culminating in my balls. Suddenly, a deep voice - my own voice boomed powerfully in both our minds.