"Look, I'll take a few sips and prove it's safe to drink." Ty gets up and leans down at the creek and starts drinking the strange color water from his mouth, his bare ass in the air for Rach to see his small pucker between his cheeks. She couldn't help but feel a bit disgusted, if not for the arousal getting in the way. Ty finishes taking a few more gulps before standing back up to face her. "See? It tastes alright to me-"
Suddenly a intense sensational feeling turns into full blown sensitivity, his whole body experiencing a extreme wave of heat and arousal as his cock becomes raging erect. Sweat quickly forms and coats his skin, his hand shooting to his crotch to pleasure it. "OHH FUUUCK-WHAT IS HAPPENIINNGG!?!"
"Oh no! Ty calm down!" Rachael gasps and falls on her rear, watching Ty's body convulse as the creek water he drank was affecting his body, possibly turning it from human state into something else...