They are trained by their family

It's early in the morning, the sun has barely risen at the Luv Family Ranch and Timmy and Petty stand in front of the barn, in gym clothes, looking tired while they just stand around.

Their asses are pretty sore from the spanking from Mama and Casey the other night for them joining the league and taken part in the Jobbers Bondage Olympics at Jobbermania

https://chyoa.com/chapter/Jobbermania-I.909335

In which Petty won and got Timmy as a sex **** for a week. Not that matters as she wouldn't know what to do with him if she did.

"I wanna go back to bed." Timmy moans.

"Hush, Tim!" Petty says, trying her best to remain still and erect, "Mama and Casey are going to train us remember? And they wanted us to come right here at six and be ready."

"But it's already hot outside! Can't we do this inside where it's nice and cool."

"No, my darling child." Mama says as she leaves the shadow of the barn with Casey, "We can not."

Both women wearing cameo drill instructor uniforms, that barely contain their large breasts.

Timmy started to get in line with his sister while Mama and Casey stands in front of them.

"We come here today because you two had done something quite foolish. You joined the league. Despite my pleas and commands. You joined the league and are now sex wrestlers. I am very disappointed in you."

Timmy and Petty look down in shame.

"But seeing how nothing can be done about it. It's time that we look into the future. And that's what we are doing here this nice, muggy, morning. We are getting you ready." Mama looks at Casey, "Casey."

Casey walks over to the twins, push them to the ground, and rip off their work out clothes, leaving them with only their shoes on.

"Ow! Mama!" Petty cries.

"Stop it Casey!" Timmy whines as Casey has trouble pulling off his shorts.

"Quiet both of you! And stand up!" Mama snaps. The twins do as they are told and stand up.

"Right now both of you don't deserve clothes. And I am not your Mama. I am your instructor. And in order to be sex wrestlers. You need to be entwine with your bodies. You need to be comfortable being naked and and also staying calm and collected while strange things happen to your body. So till I say so, you will be naked and exposed to the elements till I say so. Do you understand me?"

"Yes Mama!" Both twins said at the same time while looking down.

"Good." Mama replies with a stern look, "Now let's get started with your training."