Becoming the Bigger Sibling (Incest, Transformation, Humiliation)

from school on a Friday afternoon, so there wouldn’t be anyone home except her brother Jason. Their

mother Emily would be home from work in a couple of hours, but until then her and her brother were

free to do whatever they wanted.

The door to the garage was open, so Amanda figured her brother was in there working out again. He’d

taken it up roughly a year ago using the weight set their dad had left behind when he ran off with his

secretary two years ago. Their mom got the house and a sizeable payout from him in the divorce

settlement, and neither Amanda nor Jason were fond of their father after what he’d done, so their

current living arrangement was working out pretty well.

Amanda went out to the garage to check on her brother. Sure enough Jason was standing there doing

bicep curls in just a pair of tight athletic shorts. He had his back to the door, and hadn’t heard Amanda

come in, so she took the opportunity to check out her 19-year-old brother’s reasonably sculpted back

and tight butt. She knew it was wrong of her to look at her brother that way, but the past year had

definitely been good to his body. Amanda’s body, meanwhile, hadn’t changed at all. At age 13 she looked

like a tall, skinny 9-year-old, which resulted in endless teasing from the more popular girls at school. And

her brother.

Jason finished his lifts, put down the dumbbells and turned to see Amanda. ‘Hey there skinny’ he said,

knowing she hated that name. His new hobby may have made him look great, but it had inflated his

ego as well. He never missed an opportunity to chide her for her underdeveloped body.

‘Oh shut up’ Amanda responded, trying not to check out his developing chest and abs. ‘Aren’t big

brothers supposed to be nice to their little sisters?’

‘Fine, I’m sorry’ Jason said, holding his arms out to hug her. Amanda accepted the invitation, but

as soon as she was in arm’s reach he wrapped one arm around her tiny body and started painfully

twisting her ear with his free hand

‘OW, stop it you jerk!’ Amanda cried out, struggling in vain to free herself from his grip. He

eventually let go, dropping her on the hard floor like a ragdoll. She sat there for a while,

nursing her aching legs and ears while Jason drank from a glass filled with a strange, grey liquid.

‘What’s that you’re drinking?’ Amanda asked while she picked herself up off the floor. ‘It looks gross’.

‘It’s a new type of protein shake I got online. Not that I need stuff like this to bulk up, but it couldn’t

hurt. You ought to try it some time. Maybe then you wouldn’t be a skinny weakling’ Jason said as he

tossed her the large, round container that was on the shelf next to him. ‘Anyway, I’m gonna go have

a shower. Later, skinny’. Amanda scanned the label on the container, which read ‘NEW: MUSCLE GROWTH

POWDER FOR MEN. GUARANTEED TO MAKE YOU ROCK HARD’. She turned it over and read the other

side of the label. ‘Warning: Experimental concentrated formula. DO NOT EXCEED RECOMMENDED DOSAGE’.

Amanda figured she didn’t have anything to lose, so she took the container to the kitchen. She filled a glass

with water and mixed in a tablespoon of the powder, as per the dosage outlined on the container. The water

thickened as she mixed it in, resembling a grey milkshake when she was done. Amanda lifted the glass to her

lips and took a sip. She was surprised by how good it tasted (sweet and salty at the same time) and she quickly

drained the glass, mixed another glass and drained that as well. Suddenly overcome with a fierce need for

more of the shake Amanda mixed three tablespoons of powder into another glass of water and drained it.

Amanda couldn’t believe how hungry she was. She needed more of the strange, delicious drink inside her no

matter what. She grabbed a cereal bowl out of the cupboard, upended the container into it, mixed some water

in and started eating it like porridge. She finished the bowl quickly and let out a loud belch, then panicked as

she realized what she’d done. She wasn’t worried about the warnings on the container (those things are always

overblown), but she knew that Jason would be mad if he found that she’d used up all his powder. She replaced

the lid and put it back on the shelf in the garage where Jason had grabbed it from. ‘There, I’ve got at least until

tomorrow afternoon to figure something out’ She thought to herself as she quickly ran back to the kitchen to

clean up the glasses and bowls she’d used.

After Amanda had finished her rushed cleaning effort she was hit with a wave of exhaustion, going from feeling perky

and energized to feeling like she was about to drop dead in a mat

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