Grout or sealant and grout in the corners?

[Luggsey]

I'm just grouting a new en suite and have left the corners open until I'm sure of the best way to do them.
I'm going to presume I need to use a flexible sealant on the inside corners and where the tiles meet the tray, but, do you fill the gaps with grout first and lay a bead of sealant on top, or, as I assume do you fill the entire gap with sealant?
Groutings a chore isn't it!
🏴󠁧󠁢👍🏴󠁧󠁢󠁥󠁮󠁧󠁿

 

[Trigger]

No grout, fill the gap with silicone.