This story will have a couple of parts to it.
Train Wreck Part 1
Yosuke sometimes wondered if Souji was some sort of dumbass. He normally didn't act like it, obviously, but sometimes he just didn't catch the most obvious things.
It was one of those happy days where Daisuke and Kou would offer to treat the two persona-users to some food. Those days were always filled with dumb humor that everyone laughed about until their sides hurt. Those were days where he sometimes forgot about the murders and all the craziness happening around them.
The bell from the door rings as the doors open, and Chie walks in, immediately noticing the group. She chats for a while, before ordering multiple dishes to go (she says her family wants a beef dinner tonight). Yosuke watches as Souji and Daisuke start chatting with her again, mostly about sports ands training. He can see Kou, who's affection for her is already widely known, and he has to admit that Chie is not the brightest bulb either.
She leaves with her orders, and Daisuke catches Kou following her with his eyes. "Way to be obvious, man,"
"I-I don't know what you're talking about!"
Souji, continues eating, as if the conversation doesn't interest him. Yosuke deeply respects him, but the urge to punch him in the face rises in his chest.
"Hey, Souji, wanna help me set Kou on a date with Satonaka?"
"W-WHAT?" Of course Kou objects.
Souji laughs as Dasiuke continues to tease his best friend.
"Sure, sounds like fun,"
It was a simple answer, and they spend the rest of their time forming a rather simple plan, but Yosuke can already see the inevitable train wreck.