Where did the plot go?

he wanted to get both tho. the seme and the grand prix. that's why he chose to stay at the host club. seme is basically playing mind games with him and they were both tough, kind of like beastly types... no frilly doki-doki needed (or something like that) their courtship is kind of non-standard (￣∇￣")
also, uke is a tough cookie to beat so if he so wanted to leave, he will. he never saw himself as a victim, he view everything as an opportunity and a stepping stone.

Possible. But he hated having to be sexually trained. He was being used and he figured it out which I'm proud of him for doing. But the main plot was him determined to be a racer and if this continued I have no doubt it would have gone down that dumb route where he gives up because. He didn't seem to care anymore and was determined to prove he wasn't a joke, when at the same time he was making himself one by being a whore. All it took was one person who wanted revenge or out of jealousy to expose him and ruin everything. I'm not talking about to the press but to his Father and his Team. This had potential but it drowned. The relationship between the seme and uke doesn't have any emotion to it. The uke sleeps with the seme first because it's his "job" and he's proving a point. Then when the manga ends the uke suddenly is like "Oh it's love." REALLY? I say fail, completely.

I love how articulately you expressed literally everything I felt !
(๑•ㅂ•)و✧
It's not the sex work that was a turn off, neither was it the lack of "fluff" (I hate overly fluffy yaoi tbh; and LOVE me some strong, independent ukes).
It was manipulation and a rushed, unrealistic "character development". Also, the seme being an utter asshole didn't help either.