It could be on a dedicated children - friendly streaming platform. Some platforms focus on family - oriented content and might have a series of Ryan Reynolds reading bedtime stories. Another possibility is on his own website, if he has decided to host such content there for his fans and for the kids who would enjoy it.
There is a chance that it could be part of a special event or promotion. So it might be available on the official website of that particular event. Also, if it's for a charitable cause, the charity's website could also be a place to look for these bedtime story readings by Ryan Reynolds.