Hmm.. interesting one
I think Tsukasa could pretend to be Lilith, he knows his bf pretty good and knows his manners.. while Lilith.. couldn't. Explain is very simple. When you're a closed introvert, it's a bit hard to pretend to be an open extrovert.

Lilith! Even tho they're not always good, but Tsukasa loooves when his bf demonstrates creative activity

4. Tsukasa. Lilith is quite.. non- emotional, he doesn't like to show his emotions
14. Tsukasa: Lilith, I'm a star right? And star can't live without light.. and in my life - you're the light
Lilith: I'm annoyed by all people, without exception, but you know... you annoy me the least

21: hoping I understood that right (eng is not my first language)
From Tsukasa Lilith took manner to look after himself normally (more like Tsukasa forced to it, he's a caring bf 🤗)
From Lilith Tsukasa took manner to go outside less often. He's mad at himself for doing that tho..

2. For Lilith it's any star things. Example: if they see star pin they will definitely think about Tsukasa
For Tsukasa it's any vampire thighs, cuz his bf is very pale and rarely comes out, really like a vampire. Example: when it's Halloween and Tsukasa sees "vampires" he instantly thinks abt his bf

these are my parents 🤗🤗