I don't think you should tell his parents. This is not your info to share. He can come out whenever he feels like it. He's too young for you to break him out of his shell, out of his comfort zone. You'll just destroy him.

Would you do anything differently if he watched straight videos?
Do you really think a person's sexuality can be guided? So if someone guided you, you could also bend?

Now he's being discreet. If you force him to come out, then he'll no longer be discreet. He might get bullied and discriminated in schools. His whole childhood and relationship with his parents will be different. If his parents hate him, that'd be even worse!

I think for our generation, it's probably too early; but for kids these days?

maybe it's not him, it's someone else?