You ponder what to do next with your "mom", and you lean in and give her a kiss while you think. Your lips linger on hers, and soon you're making out like never before. Your tongues fighting, and your hands roaming all over. She places her hands on the side of your face. "Her hands feel different..." You think to yourself. Your hands slide up her waist and up toward her tits. Right as you get under them though, something feels wrong. Under her chest, on her sides, you feel three cuts on each side. You freak out, breaking the kiss. "Mom! Are you hurt?" You say as you examine the cuts. Your "mom" looks down at her cuts and gasps when her hand comes into her field of vision. Between her fingers, a thin purple webbing had stretched out to her fingertips. Her hands were webbed!
That wasn't all. As you and her take a look at her cuts, you realise that they aren't what you thought. "I've... grown gills!" She says, gasping. As she inhales, her gills flare out, trying to filter oxygen from water that isn't there. "Holy shit mom... Do you like shape-shifting into a mermaid?" "Of course not! Something's happening to me!" She says, taking a step back. As she does so, she notices that her feet also feel different. You lift your mommy's leg up, examining her feet. She spreads her toes and sure enough, between them, purple webbing has grown. "My hands and feet are webbed... I have gills..." she thinks for a moment, before smiling suggestively. "Your mommy's turning into a fish woman honey... care to take her to the bathtub? She's feeling quite thirsty" she says to you, winking seductively.