You know what I want to see? It seems like Sunflower is too dense to actually understand anything so my sadistic self wants this kinda scenario to happen. Excuse my long twisted rant:
Boy confesses> Matsuri shouts back claiming Sunflower as hers > Sunflower embarrassed, brushes aside Matsuri's outburst> Matsuri feels like this is a subtle rejection and that she doesn't see her that way at all > Matsuri leaves crying and doesn't come back > Sunflower thinks this is temporary but then realizes that Matsuri isn't coming back > Sunflower finds out through other people that Matsuri had actual romantic feelings > sunflower realizes huge mistake and realizes she loves Matsuri too > tries looking for her but can't > ends up not finding her and desperately cries about loosing Matsuri and realizing too late > suddenly seeings Matsuri walking in the distance > chases after her > Matsuri runs away > Sunflower catches up and pours out feelings > More feelings happen > Both finally realize > Happy end where both tend the shop
Not the most ideal, but that's just how I'm feeling right now. :/