Actual flow chart of relationship:-
Marta: OMG I LUV YOU YER PERFECT. Also, I'm counting on you, I know you can do it, other supportive statements.
Emil: Well, she's clearly idealized me and is in love with the fantasy, but it's nice to be counted on, and she's a good friend, crush aside.
Marta: OMG I LUV YOU
Emil: STOP TRYING TO MAKE ME YOUR PERFECT MAN, GOD!
Marta: ...(Oh balls he's right.)
Emil: (Damn, now she thinks I'm a wuss like everyone else)
Marta: (Hey wait a minute, even though Emil's a wuss, he's really trying his hardest to protect me, and he is really nice...oh crap I think I'm falling for him again...though he probably hates me.)
Emil: (Wow, now Marta's stopped hanging off me, I can really start to see her for who she really is. Despite everything she still supports me, and I really want to protect her...oh balls I think I'm falling for her.)
Ice Cave
Emil: (Dammit if I was my Ratatosk self more this wouldn't happen)
Ratatosk: (You got that right *bodysnatch*)
Marta: (Wait, he doesn't hate me? Chance!)
Ratatosk Emil: (Why does everybody seem to hate me and not my wussy normal self? I get the job done, I'm strong and all that other awesome stuff. I can actually protect Marta.)
Marta: (Ratatosk Emil is kinda brutal...and kind of a douche, but he is trying his hardest too. It's nice,)
Ratatosk Emil: *does REALLY douchey thing* (God I'm awesome)
Marta: You're a giant DOUCHE. Where's normal Emil? He wouldn't do that. (Lists actual normal Emil qualities, not idealized ones)
Ratatosk Emil: (DAMMIT)
Ratatosk Emil: (Maybe I could try being less of a douche) *tries acting like normal Emil.*
Marta: Thanks for trying, you aren't entirely a douche, are you?
Ratatosk Emil: Y'know what? Balls this, women make my head hurt. You're up normal me.
Emil: Cool.
Marta: BAWW DADDY BAWW
Emil: Look, I'm here for you. You can count on me, after all I-
ToS cast: ****BLOCK'D
Emil: Dammit
Marta: *sniff* Daddy *sniff*
Ratatosk Emil: What nice me said in a more jerky style of speech.
Vanguard: ****BLOCK'D
Ratatosk Emil: DAMMIT
*Marta captured*
Emil: MARTA!
Marta: EMIL!
Tenebrae: ****BLOCKING!
Emil and Marta: DAMMIT
*ZA BIG REVEAL*
Emil: *existential crisis*
Marta: Look, no matter what, the time we spent together was real, and Emil, I really do...
Presea: ...*****blocked
Marta: Oh come on!
*MORE REVEAL*
Emil: I love you, after all you've always been supportive of me while at the same time I could always count on you.
Marta: I love you too Emil, you're so nice and always try your hardest despite your own fears and doubts.
Emil and Marta: *check for ****blockers* *kiss*
Lucis: YAY!
Rest of game.
True Ending
Lucis: YAY!