Your hand went to Molly's transformed ear and you rubbed the webbing between your fingers, causing her to squirm in your lap.
"Another erogenous zone? you teased.
"I want you so badly right now. I need you inside me. More than ever. Becoming a fish woman makes me so horny!"
Without giving you a chance to respond, she kissed you with passion and hungry as she wrapped her webbed hand around your erect penis. Normally you would do it right here on the bed, but in her current form... You parted lips only to ask: "How about in the shower?"
"Perfect!" she said.
She wraps her legs around you and you stand up, carrying her to the bathroom. You can feel her wetness against you, the scales on her stomach, her firm breasts pressing against you. You fumble for the light switch then the knob to turn on the water. After a moment to let the water warm, you step into the tub and under the stream cascading down from the showerhead. Molly's gills fluttered a little and scales began to pop up seemingly randomly across her body. She slid down your body slightly and you entered her then pressed her back against the tiled wall. You thrust into her, your kissing hungrier, your passion animalistic. Molly clung to your needily, the tiny claws of her webbed fingers digging into your back. You barely noticed, so consumed were you by your semi-aquatic mating. Your climax built rapidly until you erupted into her and she screamed out with pleasure from her own climax. Molly's scales were now spreading rapidly across her body, covering all her remaining skin and transforming her to her complete fishwoman form.