#im not good with sibling things so this is prob bad 💀

[yasemei]

You're one of my favorite moots, and the only who shares my love for platonic hsr characters so c'mere sit down while I ramble about the idea that just popped into my head

Also MASSIVE penacony spoilers ofc (including 2.2)

Blablabpa

Anyway, imagine being the youngest sibling between robin and Sunday, just a toddler when that guy (I forgor his name) adopted the two halovians but like u were rlly sick and weak so he leaves you behind saying that u were already dead

But not long after robin and Sunday are taken away the astral express finds and adopts ur lil ass and you become the baby among the trailblazers lolol

Time skip to current trailblazer mission and robin and sunday see you, their "dead" baby sibling, and are understandably freaking tf out but you don't even recognize them cuz ur like 17 now and haven't seen them since u were a babyyy

And it's like

Robin and Sunday: omg wait is that literally our sibling

Robin and sunday: look how much you've grown omg and you have so much personality what kind of hobbies do you have, do you follow the harmony? Blablablah yapyapyap

Reader: —

tysm mootie, youre one of my favorites and I love your ideas too 🫶

lol astral express taking care of a baby while traveling and sealing stellarons 💀

you saw robin on media before, she looked like you and you looked like her, this confused u but u thought it was just a coincidence and didnt think much about it

then you travel to penacony and you saw the two siblings who look very similar to you????

you three talk and it turns out youre their lost baby sibling! shocking all of you

robin and sunday are happy that the nameless took care of you and that you survived thanks to them

reader might choose to stay with their astral express found family who raised them or return to their biological two older siblings