14 short chapters to a confession. Given how many pages are in normal chapters, it'd probably have taken at worst half that for them to confess to eachother if this was a normal publication.
Everybody is missing the obvious: Truck-kun, being a cultured truck, was tired of the constant lack of yuri progress, so he took it upon himself to play the villain and created a scenario so that the girls could finally admit their love for each other.
Truck-kun never had any intention of isekai'ing Tadokoro nor Nikaidou.