Katie begins to grind her body against you while she continues to fondle your "breasts". Your arousal is incredible. Why must you be stuck a pool toy?
You realize your breasts are shrinking and you began to feel warmth where your crotch would be. As your breast pillows completely flatten, Katie doesn't seem to care. She reaches down to her bikini bottom and slides it down, exposing her vagina. Just then your penis returns and you realize you have transformed from a mermaid pool toy into a merman pool toy.
Now when Katie grinds against you, she unknowingly slides right onto your member. Her eyes had been closed as she aroused herself with you. Now they open wide in surprise but they almost immediately roll back in ecstasy. You can't do much as a pool toy, but Katie seems to be able to handle things just fine.