Schoolgirl stepsister seduces her stepbrother to help her with her classes and they end up fucking

Um...

Today I asked you for a favor

About?

About the class

Oh, well, show me.

And what task do you have?

Um, physics.

No, but what physics?

I don't know much about physics.

Hello.

I can't help you like this.

Help me be bad

No, it's just, I can't, I don't know.

I'd like to help you

Besides, I have a meeting with a friend and I can't.

And I couldn't help you today, right now.

Please, please.

I can't.

I don't know, no

I know you know

Yeah, and maybe a little, but it's just that, anyway, I have a meeting with a friend and I can't help you.

I mean, you prefer a friend who helps me be bad.

Um...

Well, if you don't ask me that way, then you've already changed things, haven't you?

Hmm?

You mean if you help me?

Yeah, but what changed?

I don't know, if I may.

Yeah, I'll help you.