It goes as one would expect

Timmy and Petty enter the center of the makeshift ring in the barn, with only their tennis shoes on, sweaty and red from their morning excerises.

They just stand their awkwardly till Casey puts her hands to her lips and yells, "Come on you two! Get to fucking already!"

Mama slaps Casey on the back of the head." Casey!"

"What?"

"These two will be ready when they are they ready. So hush?"

Casey mumbles, "Sorry Mama."

"Come on Timmy, let's do this."

"I don't want to!" Timmy whines. "I just want to go back into the house!"

"Come on Timmy! We are doing this!" Petty grabs Timmy's arm from walking away.

"No, I am not fucking you! You are my sister and you might have cuties."

"Cuties? Come on Timmy. I don't have cuties. And besides Mama and Casey fuck all the time in the ring."

"Yeah, but still. I don't want to."

Timmy and Petty begin to struggle

"We are doing this!"

"I don't want to."

"You have too!"

"I don't want to!"

"We are doing this!" Petty then slaps Timmy on the face.

There is stunned silence as Timmy registers the hit he got from his sister.

He touches his face, "Petty...you hit me."

Petty looks upset, "Well...you deserve it. For being a cry baby all the time."

"Am not!"

"Am too!"

"Am not!"

"Am too!"

"Am not!"

Timmy then slaps Petty.

Petty is shocked by this.

"Oh Petty. I am so..."

Petty then slaps Timmy and Timmy is taken back and slaps Petty back. Then vice versa till they were doing in a quick succession of each other, making each other's cheeks red.

"Wow, this is boring." Casey mutters

"Shush. They are learning."

There are tears in the twins' eyes while their cheeks are bright red.

"Stop it Petty!"

"You first Timmy!"

"Argh!"

"Argh!"

After a few more slaps Petty leans down and pulls on Timmy's dick.

Timmy groans in pain as he falls back.

"Petty, you touch my wee wee."

"Sorry, Tim, but this is sex wrestling."

"That's it Petty!" Mama yells, "Keep on him!"

Petty nods her head and grabs Timmy by the arm and spins him around and throws him into one of the bundles of hey.

"Whoo!" Casey screams, "That's a girl!"

Timmy is a little stunned while Petty, feeling motivated, screams and runs towards Timmy, where she falls down on top of them.

Timmy is taken out of air while Petty's eyes are widen.

"Get off of me, Petty!" Timmy struggles, feeling something wet and tight on his cock.

Petty doesn't move as she looks stunned.

"Um. Tim."

"Yeah, what?"

"You're inside of me."

Timmy realizes that his dick is in Petty's pussy, and that feels good.

"Whoo! We are breaking a cherry!" Casey yells, slapping a knee.

"Thrust into her Timmy!" Mama yells.

Timmy does as he is told, thrusting into her weakly but Petty moans as this is their first time having sex.

"Is this....is this what sex feels like." Timmy asks grabbing his sister's ass and pushing her onto him, "I think...I think I like it."

Mama and Casey scream and applaud as the twins fuck for the first time.