Agree

"If you say so," you hear your voice speak, but don't remember saying the words. You're appalled at the monster you've become, a horrible demon that has corrupted an innocent girl, but you can't help but think about how much fun it was, and how much fun it would be to corrupt another four people, possibly even at the same time.

"You'll probably need some help," comes another voice, one that Alicia doesn't seem to hear. It's the demon, again speaking directly to you, as he continues, "I'll use my power to provide some. Just touch the water, and everything will take care of itself from there."

You relay the plan, or at least as much as you know about it, to Alicia, telling her to stay out of sight until you walk down to the water. She mentions that it'll seem a bit odd that you don't run out together, but also that the others shouldn't notice until you make it to the lake's edge. Planting another kiss on your cheek, and giving your cock a brief and gentle stroke, she finishes by saying "Do it quickly, so we can play again."

A brief smile crosses your face before you turn to leave, and you quickly stride from the small room on your hooves. When you exit, three of the group are still in the water, but the fifth white-haired woman, who Alicia called Crystal, is nowhere to be found. Like she said, you make it to the water before they notice you, and then start to swim in your direction, puzzled looks on their faces.

The instant you touch the water, however, the clear surface starts to change. It becomes a bright pink, originating at the exact place you touched it, and quickly spreading outwards. No one notices until the corruption has spread near them, and by then it's too late, as it quickly alters the very water they're swimming in. The effects are instant, as heat rises to their skin, their faces blushing. Brittney and Josh are quickly tenting their swimsuits, and you can clearly see the imprints of Brittney and Hanna's nipples against the fabric covering their breasts.

They finish swimming over to the shore by you, but are clearly working harder, overcome by a wave of arousal. "Where's... where's Ali?" Brittney poses the question around deep, long breaths.

"Well, I'm here of course!" Comes Alicia's singsong voice, as she struts out of the cave, naked pink body clearly on display. "Get out of those suits and let's have some fun!" The other three share a quick look, clearly apprehensive, but also steadily losing any willpower to do otherwise.