Don't Open that Door

My sister very innocent at the time,
she knew no better.
I knew better on the other hand.
Aferall i'm several years older.

One day she needed something,
what i don't remember.
She called me away from my activities
"SISTER!!! WHERE'S MOTHER?!"

Of course as all elder siblings do,
"SHUT UP! I'M BUSY!" I retorted.
Annoying as she was then, and still is,
I had no intenion of being annoyed by her.

Still she didn't get the memo of not to bother me,
And nagged until i finally gave in.
"WWHAAT?!" I screached at her.
She gave the innocent look and spoke "Where is mom?"

I rolled my eyes and shruged,
for i didn't know or want to.
I could care less of what they were doing,
and continued with what i was originally preoccupying my time.

Suddenly many moments later i heard a "FOUND THEM!".
I inwardly cringed, i knew all too well what was going to happen next.
I didn't stop my sister though,
I figured let her find out herself.

My little sister opened the parents' bedroom door,
and to her surprise, she found something that she didn't expect.
Of course being the brat she had to get me into the act too,
and being young and stupid i fell for it.

Unforunately to my surprise as well as my sister's,
my "sweet" little sister had caught our parents in the act.
The sexual acts that were meant to be behind close doors she discovered that day,
And much to my parents dismay, she now knew how babies were made...

After that day,
no one really opened doors without knocking,
Everyon in the family but my sister.
Apparently she didn't learn her lesson the first time...