Ok, but here is the whole paragraph :
Its fragile and delicate texture affects the attitude of anyone who leafs / leafing through it. His actions become more cautious; he delicately turns the pages, with just the tips of his fingers. We assume a change in his attitude, a change that would never have taken place had he been confronted to any other casual newspaper. Anyone skimming through it becomes aware of the uniqueness of the object he is holding, of a richness he could not have initially suspected in it.It goes on and on with this anonymous person leafing through, you see... The more this thread develops itself, the more I feel lost.
Maybe I can immediately go for a plural : Its fragile and delicate texture affects the attitude of those who leaf through it. Their actions... they delicately... their fingers and so on.
Yes, I'm going to stick with the plural - fed up!