How to sell access to a particular post for more than just one view

I have a membership site where people can pay to have access to all posts. But I also want to allow people to just buy access to individual posts. As far as I can tell 'pay per view' doesn't allow ongoing access to a post just onetime. Have I missed a setting?

I would be ok with the period pass if you could make it just for an individual post. Is that possible?