My matsushima/junmatsu headcanons:
.-Junko fell in love first
-They met when they were seven
-Junko loves horror movies and often wants watch them with him. Matsuda doesn’t like these types of movies and he never wants to watch them because he's afraid of horror movies but Matsuda always agrees to it after all
-When they were kids and Matsuda was sad because of his mother, Junko went to sleep with him. He pretend he didn’t like it but he did
-After Matsuda’s mother death, Junko gave him a stuffed rabbit to soothe his pain after lost his mother. He has it in his lab
-Junko found out about Matsuda’s mother 3 years after met him
-They have been in relationship since they turn 14
-Junko was very possesive and they argued a lot because of it
-Junko visited Matsuda in his lab everyday. She liked sit on his lap and observe his work
-In primary school they sat in the school desk together. Teachers didn’t like it beacuse they were talking with each other
-Junko likes kissing on the neck
-They’re both have cold hands
-When Yasuke is frustrated or upset Junko strokes Yasuke on the back or hair to calm his down
-In the end of danganronpa zero Matsuda said he hates and loves Junko at the same time. But no matter how much he’s mad at Junko, he never could stop love her
-Shortly before Yasuke created Ryoko, Junko completely isolated herself from everyone (mostly because of her bad mental health and despair from being alone). In that moment Yasuke was ready for death. He was sure that Junko left and forgot about him (something that she promised him she never do). Junko knew well how he’ll react to her disappear. She wanted his despair