That's sussy, Ichika
I can't be the only one who absolutely adores the relationship between Raiha and Fuutarou, right? A healthy sister-brother relationship that's wholesome to boot? Never gets old. We can see throughout the manga (I haven't watched the anime) that Fuutarou is extremely motivated by his desire to give Raiha a proper life (though his motivation later expands into his friendship with the quintuplets).
---SPOILER WARNING--- (Why are you on a wiki discussion thread if you haven't finished the manga you fool?)
At the wedding timeskip, even as Fuutarou goes to marry Yotsuba, Raiha still helps him with the rings and remember them. He relies on her even when he's 22.
Additionally, Raiha gets along well with Itsuki Nakano, something that allows the two [, Itsuki and Fuutarou] to become closer through a mutual individual [, Raiha].
If ya'll see this, I wanna hear your opinions and thoughts on Fuutarou/Raiha the relationship (i.e. do you enjoy the dynamic? etc.).
Have you guys never thought of like Yotsuba dressing up as Itsuki and kissing Fuu-kun in the anime( I haven't read the manga yet but im planning to i just dont know where to read it lol) cause like the sisters dressed as Itsuki for their Grandpa, knowing that Yostuba is the only one that can run fast, Im guessing its really Yotsuba that Fuu-kun will marry. They might have just showed that Itsuki was the one that got married to Fuu-kun but maybe just maybe they showed us that so that we would think that its Itsuki but its actually Yotsuba.
(Idk if anyone thought of this lol cause this "theory" of mine couldnt let me sleep so I just had to say it here so that I would also know if people agree with me or if they thought if it also. Lol)