How to let some given user view my post?

Let’s assume there is a scenario like this:

I am Tom.

I am a user of a website build with Yii2 framework (yii2-app-advanced template).

I had post some articles but I did not want let them open to everyone.

Jerry is a friend of mine and he is an other of the same site, too.

I want only let Jerry view my posts.

How can I achieve this?

Is there any ready-made extension could do it?

Thank you.