Does Japanese Wikipedia just have misinformation about England on it? A duke in the modern time would have about as much political influence as the owner of the average hotel (so, not zero, but BASICALLY zero).
They're building this manga out of overused tropes like Legos (even counting someone pissing herself in the first 5 chapters!), but failed to realize that the combination of "reborn as a child and doesn't grow up for 90% of the story" and "sex magic power", when combined, cause a truly atrocious...
This is obviously written by a pervert, but like, one of those ascended perverts who turn everything they touch into literary gold whether they're trying to or not.
This is a whole new level of wish fulfillment. The skill just happens to ONLY work with their team composition? And on top of that, she's his teacher? And they're just instantly okay with being trapped in another world together. You know the author wrote this in high school while lusting over...
The story is completely incoherent, even CONSIDERING the bad translation (or typesetting, since this is listed as being originally in English). The art is really good though.