You float on the water surface, a female mermaid pool toy. You can only watch in horror as your two nephews come running over and cannonball into the pool.
Josh lands right on top of you! Dave frolic's in the water, swimming next to you. Josh rubs himself over you and fondles your rubbery breasts and giggle. Each rub brings louder 'squeaks', and neither of them notice that they are now cursed. Slowly, they begin their change into pool toys.
Dave finally notices that Josh is turning a dark blue. "Hey, what's that?" He points at Josh's back. A small bump is slowly growing larger. It's a back fin! Josh's transformation continues faster, having had the most intimate contact with your pool toy body. He grows bigger and rounder, filling out. His legs merge into one large tail fluke. His skin takes on a rubbery sheen. Arms shrink and form fat fins and a once human head balloons up into a large whale head, merging easily with the swelled body. The newly transformed whale inflatable, vaguely resembling your nephew Josh remains on you, unable to move anymore.
Dave watches in utter shock. His own transformation is much slower, having had less contact with you. He treads water, not sure what to do. Using his hands he pulls himself away from the bizarre scene. His hands feel odd. Looking down he sees in horror that they're changing!
Dave watches as his own transformation begins...