preventing showing protected content on browser back

Hello. I have a wordpress site with protected content (avaiable for logged in users). The problem is when the user logs in, read for a while and then go to another page and leaves computer with browser still opened. Someone else come, click BACK button on browser and see all protected content (but should be forced login page again). It’s even if the user session timed out. Is there any plugin or solution to prevent this happen?