Aquatic

"...a fish. Or something along those lines, they just seem so worry free."

"I do see ya as a mermaid." I joke, which earns me a playful slap on the arm. I gave Becky the pill with some water and start filling a bucket with water.

Becky cried out in pain as her body changed; ears became finned, pearly sand colored scales replaced her skin, webbing between her fingers, her hair became stiffer, gills appeared on her neck and fins replaced her toes. Good Lord, she was hot!

"wow...you look...amazing!"

She blushed, and took the moist cloth I gave her to keep her gills moist. As we couldn't do a full-exam down here, I moved what I needed to the Master Bathroom. It was spacious enough. And I filled the tub with water for when Becky needed to go under and keep from suffocating. Besides the basic examination tools, I also brought up the X-ray cream.

I tell Becky to lean over the tub, with her butt towards me. Her vaginal area was untouched by scales, but a bit paler in color. Then placed the thermometer inside her pussy to check against the Oral temp I'd take after. Comparing them to be the same, I deduced that in this fish-form Becky had the same temperature as a human.

Becky dunked herself in the tub, before sitting up to let me check her upper torso. I noted that her eyes were more rounder than her human ones, and thankfully, unchanged. Looking in her finned ears; Becky's eardrum was smaller and that her ear-fins were a bit sensitive.

Ok, very sensitive. She tried to punch me when I touched them.

Nose was fine, her mouth looked normal on the outside. I feel her neck and jaw before picking up the tongue depressor. "Open wide, Bec. Bit more...more...good. Now tongue out...all the way...that's a good girl..." My sister's mouth was now a lighter pink while her tongue was darker. I saw that she had no Uvula; like a fish, and peered down her throat. "Say 'ah'."

"Ahh...hh~"

"Cough."

*cough, cough*

Content, I put the tools down and fingered my sister's mouth. Feeling all around, and mentally smirking when she slightly shivered from pleasure. After removing my fingers, I moved to her chest and listen to her heart beat and lungs. Heart was normal, yet her lungs were larger so they could receive the air from the water. And speaking of larger...her breasts were huge!

My mind went blank for a second, then started to examine/grope them. Her nipples were the same as when she's normal; and the breasts themselves were more firm. "Hmm...."

"Wh-what?" She asked, trying not to pant in bliss.

"Nothing. they're very healthy, now then float on your back."

Becky did so, and I made sure all her bones were place before rubbing the X-Ray cream on her abdomen. I saw her stomach, was normal, and her Cervix was now larger. Plus an egg-sack replaced her Ovaries. I then have Becky climb out and lie on a moist towel with her legs spread.

I spread her outer lips; seeing her vagina in the same dark pink as her tongue. I play with her clitoris for a bit; making her pant before I stick two gloved fingers in. To my surprise, she took them easily. Same thing happened when I did four fingers. "Perhaps aquatics adjust more easily than other species..." To test that, I insert my whole hand. Creating a large bulge below her stomach.

Becky gasped and arched her back, letting out a strangled moan from the feeling. "S-So...full! Ooooh..."

My theory was right, and I remove my hand from her insides. She took me opening the Speculum fully without any fuss; and I marveled at her vaginal beauty. Once done, I have Becky sit up. She's so turned on right now...we both get in the tub. My sister pumps my rod with her hand, and I have her put it in her mouth. with no gag-reflex; she slowly takes me down her throat. "Mmph...mm...mph..."

"Your mouth is so good, Bec." I mutter. "Take it deeper...good girl...ah, yeah..."

After she's done with that, I have her lay down under the water...her legs around my waist. I enter her and start to pound her pussy. She's so warm and her muscles clench around me as I keep going...hitting her G-Spot a few times.

I feel my end coming, and lift my sister up out of the water and then take her anally. Soon I'm releasing my seed into her bowels. Once that's over, she changes back. Both of us panting and tired. Becky dries off and I clean up, plus draining the water from the tub...