[@OliveYou]
Well that's sort of where you come in actually. 

Seren's Illusion Manipulation, as described in their CS:

[quote=@Metamore]
Currently, this ability is constrained to guises of themselves and small mirages. Seren can make themselves appear more like people from the target's dreams. While their skin, hair, and eye color change, and while Seren has even learned to partially glmaour clothes they're familiar with like their signature hoodie, Seren can never seem to hide their horns. On top of the fact that Seren's illusions only effect their deliberate target, it doesn't make for make much of clever disguise as of yet. Outside of looks, Seren has been known to pull small objects from their targets dream into reality as ghostly after-images of what they were once were imagined to be. This takes considerable effort however, and is still only visable to the target and Seren.[/quote]

So if you'd like, you can write Lalisa's dream sequence like CherryWitch did for Raphael, and I'll see what Seren can pull from that to disguise themself, and partially Lalisa too if at the cost of their already currently limited stamina. Just as well, you can have Lalisa wake up too,and continue writing as you normally would, seeing as Seren's presence in people's minds can still be jarring even if undetected. Its up to you :)