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CYOTF (Human)

Boobs for Sis

added 14 years ago BM

I can’t believe such a product exists. Surely this can’t be real right? Maybe I’ll try it on my sister first, since I have no interest in having boobs.

My sister is currently sixteen and in high school. She is rather fit with long dark hair and a really unimpressive chest. I’m not saying my sister’s hot or anything, but I’m comparing her beauty to other girls that I’ve seen in school. She spends most of her time in her bedroom or at the mall, so I’ll go check her room first. I hold the gun prepped in my hand and knock on the door. She opens in a pink shirt and jeans.

“Yes?” I waste no time and aim the gun towards her. My finger presses in the green trigger. There is no flash or any audible sound as expected. My sister just looks at the gun and back at me with a blank face, surely wondering why she even bothers with me. What a waste of money. Oh well, it was good for a short laugh on my part. I begin to return to my room

“Ummm, I feel really strange all of a sudden,” she says.

“Hmmm?” I turn back around to face her. She is not looking at me, but rather down at her body. She appears to be in some sort of discomfort, tugging at her shirt here and there. Suddenly, her chest is beginning to push out! Her breasts are pushing out further and further! Holy shit! My sister is screaming and flailing her arms about in the air, afraid to touch her chest. Her shirt continues to grow tight around her increasing bosom. The bottom is rising slowly, showing off the top of her jeans, then her tight stomach. Both of us have not muttered a comprehendible word. Her shirt is now so tight that I can see her bra’s battle with the breast flesh clearly. There is a considerably large mountain of flesh being pushed up by her small bra, making large mountains. Her nipples are also becoming much more visible. I’m sure they hadn’t been this big before the expansion.

*SNAP*

My sister’s bra finally lost the battle, and her new huge breasts fell down and sagged onto her chest. Their motion took and trapped some of the fabric of shirt with them, only helping to outline their beautiful shapes further. I’m not an expert on breast sizes, but they were more than a handful from appearances. About a D-Cup I guess? I expected my sister to scream even more or close the door and hide, but she did something that I had not planned her to do. Who am I kidding? I didn’t even expect this stupid gun to work in the first place.

My sister grabbed the gun out of my hands.


What do you do now?


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