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As much as I love obirin I wish their friendship (as in before Obito's crush on Rin) was more explored.
How they met? What games they played? Did they ever had a sleepover? What Rin's parents thought of Obito (as they liked/disliked/or was neutral towards the boy)? Did they ever have some really awkward situations (like losing a swimsuit in the river)? Who is better at cooking? What secrets do they share? Did Rin ever dress up Obito in some dresses, put makeup on him, paint his nails and did he like it? Was it Rin who had to have a “bees and pollen” talk with Obito? How come they both have a stalking trait (I'm saying it because of all Rin's “I'm watching you” talks and how on all photos that Obito had hanging on his “secret board” Rin was sus good looking)?
And so on