Step mum's milk(1)

Author's note: This story contains references to breastmilk, if you do not like that, then move on to the next story.

Main characters:

Me, Steve 18

Carley, stepmom 30

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Three months ago I became a new half-brother at the age of eighteen.

Even though I knew this could be considered normal, it still felt strange being so much older than my new sister.

My dad was 53 and two years ago, he married a 28-year-old woman. Cutting to the chase, she had her child three months ago, at the tender age of 30.

It was strange when I went over to see them with a baby at first, but over the months I got used to it.

One day I walked up to my Dad's place, took out my key, and unlocked the door letting myself in.

"Hello!" I screamed as I walked in.

"Hey Steve," my "stepmom" Carley called. "In the ……