If you're looking for R-18, or at least some kind of kinky stuff, you probably shouldn't get your hopes up in this. The only stuff that happened are kisses and some fan service rubbing.
Since he always gets the first prize or that prize that he needs because of his x777 luck and lending them to his demon sword which evidently has more base luck than him
Especially that princess of idk comotoria (?) kingdom named Aura. Like, why is she even there? She has nothing to her except being part of the royal family. Even the MC's platoon captains have more personality to her.
Yes, Delfina wants the MC to buy her but the MC still proceeds to embrace her without buying her anyway. This doesn't mean that the MC forgot to buy her. He just thinks that since he'll eventually buy her someday, it won't be a loss if she gets richer first. Also, if you read further, Delfina gets a character flashback arc which explains why she is so obsessed on the concept of getting bought by money.
And yes Mr. Author, we understand that no one can see through Eleanor's aura unless they are stronger than Eleanor. Stop repeating it 3 times in a chapter please. Also, we understand that Kakeru likes good women. Him repeatedly saying it just makes it seem that he's a man of words only.