Hey Angel!
That dream doesn't play a role on future events/interactions with Lyriel, it's a contained dream that has different renders/dialogue depending on what you choose. That's about it really.
gotcha, the way it played out made it seem like if you chose to free her in that dream it wouldn't lead to the follow up dream with her in bed, tied to it. There's been a few choices that I have tried while doing her events that I figured were bad options but they still progress in a different way than I expected... the one I just got being an easy example, ordering her to read aloud in the library. I expected her to snap and storm out, but she almost seemed like she liked being ordered to do something. It makes me really curious if she has a split path on how she progresses based on how you treat her, like how if you choose to stay silent in the early options it seems to become a flag that she calls out when you suddenly give her the silent treatment again. Like it almost feels as if she has a route where you could basically train her out of the weird bratty tsundere nature she has or something.