Bird

"I'd be a type of bird."

"Really?"

"Yeah, I mean I do love that kind of animal."

I hand her one of the pills, and she swallows after I tell her that all that happens is normal. Becky starts moaning in pain and I see feathers appear on her arms. Plus her legs change into scaly bird feet. Soon her arms were wings, and her lower half was that of a bird...tail too. The feathers were the color of her hair, and soft.

"How-How do I look?" Becky panted.

"You look great! Feathers suit you, sis."

She blushed, then looked at her tail feathers while I turned on the MRI. I explained that I wanted to check if the transformation had changed her insides; but first I had to check her temperature. We did it orally first. Which came out normal, then...I had her lean over the table.

"This is embarrassing..." She muttered.

I gave her bottom a smack. "Hush, and stay still." I insert the thermometer into her pussy and wait until it beeps. When I check it, it's normal too. After cleaning the tool, I have Becky lay still on the table as I have the MRI scan her. While her human organs were fine; Becky now had a Gizzard like all birds did. Plus a larger womb. Which made sense as if she was excepting, the eggs would be held in there until she laid 'em. I also check her heart beat, which was now beating quicker like a member of the Arial family. I then measured her wing-span; they were twice as long as a mans.

"How do you feel, Becky?"

"I feel...odd. Like I want to eat some worms."

I laugh. "Well, the pill will wear off soon. As I only gave you one, you'll be like this for thirty more minutes." I put on gloves. "So...raise your legs."

Becky puts them in the stir-ups, and I see that her pelvic area is larger. I turn on the overhead light and insert two fingers, she shivers but relaxes after a minute. I feel around; finding that her ovaries had grown too, and then withdraw my fingers before opening her up with the large Speculum. "Looks good in here, Bec'."

"That good news."

I clean up, then rub my sister's coltis...making her moan. "You've been a good girl Becky." I tell her. "I should reward you..."

"O-Oh! Yes...Yes, please!"

"Tell me what you want." I pinch it, making Becky arch her back.

"Ah!-stick your rod in me...Please!"

I chuckle and disrobe, before straddling my sister. I squeeze her breasts while I slipped inside her woman hood. Becky gasped before lifting her hips as if to help me go deeper. I kiss her lips, and ran my tongue over each tooth and her oral muscle. Her wings folded over me, hiding us from the world. I feel her shudder when I hit her cervix hard over and over.

When I pull away, I ask, "Is the little bird ready for her favorite treat?"

Becky nods, and I pull out of her before making her sit up a bit.

"Open wide."

She does, and I shoot my cum into her mouth. Becky swallows and then changes back to normal. Her body flushed and a bit sore.

"Was that fun, Bec'?"

"Y-Yes, it was."

"Want to do it again sometime?"

She nods, "You pick the animal next time."

I agree then help her into the Study to rest, so I could clean up.