Skin-to-skin contact

Shivering you ask, “How are you going to get me warm? This pool has made my manhood retreat back into my body.”

Her eyes looks into yours, “Are you talking about shrinkage?”

“Yes. It’s real and this pool proves it!”

As you turn to walk back out of the pool, your sister-in-law presses against your back, soft tits against you. Her hand reaches around and snakes down into your shorts.

Her hand grips your dick.

She giggles in your ear. “No way this is shrinkage.”

Your sexy sister-in-law in a skimpy bikini squeezing your dick in a pool.

You dare her, “Keep holding it and you’ll discover how big it can get.”