If that's what the quest log says, then that's what you need to do to advance her story. Not wanting to do that might just be a personal preference for you or something, but in case morality is the question: keep in mind that Lyriel is a typical tsundere. She protests a lot but really does want intimacy with the MC. For example, when she eventually gets intimate with the MC (as all LIs do), she puts up only very mild, obligatory objections — she protests only slightly, and only because it's "proper" in her mind. But she'll freely let the MC make love to her, loves to have him kiss her, and even asks for intimacy if it's been some time since their last intimate moments.
But if it's just a preference thing, just do it the one time and it's not required thereafter. (It's a repeatable scene, but you don't need to do it over and over in the future.)
Nah, I don't remember what was in the quest log but it was something non-specific. Choosing the option I SPOILER'ed brought -3 Intimacy and just made her upset... like, actually upset. I needed to wait for another scene that occurred in the Evening/Night event chains to make the scene more natural, and led to a regular scene before the daily one.
The real problem was that this event should have played sooner, but where I am in everyone's quests atm, I had like... 15 or more events lined up in the Evening/Night category that many are backlogged, so when someone says they'll "Come see me tonight" or similar, it doesn't happen for a couple days at least... so it's difficult for me, as a player, to know if I'm supposed to do something, or if it's just backlogged.
It really feels like the majority of my events are weighted towards Evening atm, which is a small complaint really, but my Mornings are currently relegated to reviewing repeat scenes, scavenging the fridge/wardrobe/library or using Daydream in the Backyard/having a Shower in the upstairs bathroom just to pass the time. Love all the attention, but it still feels a bit odd. xD
Glad that MC learned to do Daytime Etherwalks, or it'd be even worse! lmao