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Daki I think to be the type to bully her crush
Like she would call you ugly
But her heart would always flutter at the sight of you as her words would be stuck in her throat
she would insult you constantly but when talking with her brother she would be like
"Y/N finished their work the fastest today! They're so cool and smart!"
or "Hey Gyutaro! Did you see that Y/N had their hair down today! They looked so pretty!"
And god if you compliment or be nice to her she is dead
Full on red-faced as she insults you but on the inside, she is on full fangirl mode
But if you don't get along with her brother then she will just hate you
Speaking of Gyutaro
If you and Daki do end up dating he would constantly be threatening you if you broke his little sister's heart
of course behind closed doors to not upset Daki
Daki is a tsundere at the beginning but once you get to know her she gets more flirty and confident
"Hey Y/N even though you're an idiot you still have pretty eyes and I think your cute so you better go out with me!"
Now I imagine Gyutaro is like his sister but instead of flat out insulting you he would act like he was annoyed with you
if you did something he would always say you were annoying or a bother
Gyutaro would kind of be a secret admirer as in he always stares at you and admires you when you don't look in his direction
he thinks you're really pretty but tries to avoid you always saying "You shouldn't be around someone like me" or "Don't bother talking hanging around me I'll just drag you to the bottom of the social ladder"
(No please baby lemmie give you kiss)
He knows his ugly so he probably won't bother to confess to you, so you gotta make the first move
If you were to compliment him in any way especially his appearance he would think you're lying right of the bat
he won't even take the compliment he would be like "No"
He would Uno reverse you but wouldn't want to look like a fool in front of you
If you got along with his sister he would just fall in love with you even more
If you did manage to convince him you felt the same way
he would be really shy during your relationship
if you allowed it he would definitely mock every single person he meets later in your relationship like
"Oh you're single how pathetic I unlike you have an amazing S/O named Y/N"
he would take care of you like Daki if you were sick or feeling bad would stay up all night just to make you feel better
Overall 2 tsundere siblings I would 10/10 recommend dating that have no idea what love is so please be kind and gentle with their feelings