Sounds interesting. I want read this as well.
as far as i remember, the fl isnt a fujoshi nor does the prince have any relations with his retainer. however, she does build stuff using her knowledge from the modern world:
http://www.mangago.zone/read-manga/i_choose_the_emperor_ending/
also the fl is mistaken as a guy by the prince, so it gives a sort of bl vibe
i could be wrong tho
Just read this during the weekend. Is it this one? http://www.mangago.zone/read-manga/iris_lady_with_a_smartphone/
It's not this one but thanks
Ah read this but it's not the one I'm looking for. Thanks though
Found it. It's called Daites Ryou Koubouki if you want to read it
Forgot the name. But it's an Isekai with female lead who's a fujoshi and has to marry an abandoned prince who was the crown prince and he has relations with his retainer. Female lead uses memory of modern world to build technology