Use the tool.

I lick my lips to calm down and watch my sister lean back and spread her legs, letting them dangle over the sides of the bed. Then spread her out her outer lips to reveal her womanhood.
And I got my first view of a pussy.
My heart began to pound against my ribs...this was nuts.
"You alright?" Jane asked.
I blinked to clear my head. "Y-Yeah. So...how do I use...'these'?"
"You just stick it in me...and you turn the little knob on the side to open it...and me, to see inside."
My hands shook as I picked up one of the 'bird beaks'; a medium one, and began to insert it.
Jane hissed while biting her lip, and I stopped.
"Am I hurting you?" I asked.
"N-No. It's just that...there's some pressure when it's inserted." Jane explained. I turned the small knob on the side and opened my sister up. My mouth became dry as I look at my sister's...whatever it was.
"Well? How's it look?" Jane asked, through her teeth.
"F-fine!" I say, a little too fast. "Just fine!"
She giggled at that. "Good. Any questions?"
"What am I looking at? I mean..."
Jane raised an eyebrow. "You're looking at the entrance to my womb."
My face went redder. "Oh."
"You want to touch it?"
"What?!"
"I asked: You want to touch it? You can if you want."
My head whirled and both sides of my mind argued; I wouldn't get a chance like this until I found a girlfriend...but at the same time this was my SISTER for crying out loud!
I battled my inner demon as much as I could...but it won. Maybe...maybe just one touch? That wouldn't hurt, right?
I took a deep breath and touched the pulsing pink orb in my sister. It was warm and slippery. I rubbed it a few times...making my sister shiver.
"Whoa...that feels...odd." I mutter.
Jane began to pant. "I'm sure."
I withdrew my finger and removed the tool before putting it in the Tupperware...after removing the others and putting in fresh ****.
Kneeling by Jane, I ask, "Your face is flushed...are you ok?"
"I'm fine, John." She sighed. "But you still have to check for lumps."
I groan. "Ok...how?"
"The Doctors stick one or two fingers inside...and then feel around."
If mt face got any redder, I'd be a tomato. Great...just great. I sit before my sister's open legs again and stick in a finger slowly up to my knuckle. There was something hard...but I figured it was her womb.
It was warm and squishy...I could even feel her pulse! I began to feel around and Jane began to slightly wiggle. What was going on?
I began to move my finger in and out of my sister...as I did her wiggling became thrashing and then liquid spilled onto the sheet and my hand.
Jane looked at me with cloudy eyes and a weary smile, "Well...who would've thought my little brother would be the one to make me cum."
A gasp was heard and we both turn to see...