Lol, wondering if Shion was using the whole haunted house bit as a way to be able to cuddle with Takuya a bit.
And we have our confession here. Takuya's concerns are reasonable, but full respect to him for taking that step forward, as he loves Shion just as she is. As for Shion, she's accomplished the one thing she aimed to do from the start of the story.
Takuya wanting to keep his relationship with Shion secret for now is reasonable, as, at least for now, she hasn't definitively committed to which path she will take going forward
Fireworks festival can't be for a confession, given they just confessed, but other significant things will come out of that event...