What is my stepsister willing to do in order for me not to tell her secret

What is this?

The girlfriend forgot.

What girlfriend?

You don't know.

Why is it in your drawer?

Well, I slept over and forgot.

Don't tell your mother.

Interesting.

Oh, come on, we're adults. Take your charger and go.

So...

You're not a **********.

So you're already doing this?

So what?

Well, let's see how you do it.

What do you mean?

Literally.

What are you doing?

What are you doing?

Go take your pants off.

What for?

Show me how you do it.

Then

Otherwise, Mom will know.

Are you sure?

I'm sure.

Well, I did.

Take it in your mouth.

Why?

Well, you want to keep it a secret, don't you?

Are you sure?

What?

Well, you're my half-brother.

What's up?

Look at me.

And look at me.

What are you doing?

Fuck your mouth.

Are you sure you won't tell me?

No, no.

I won't.

It'll be our secret.

Oh!

Oh, my gosh!

That's it. Now it's our secret.

Don't tell me.

Of course I won't.