Unrelated to the chapter, but I did a bit of research into 犬養, because it’s not a family name I’d heard before. There’s actually a number of famous people named Inukai, but one in particular caught my eye: Inukai Tsuyoshi was Japan’s oldest serving prime minister, taking office in December 1931 at the age of 76, but he only served for six months before being assassinated by the military in May 1932 (mostly because he preferred that they not invade China as they were in the middle of doing) - which effectively marked the last time the military obeyed civilian oversight until the end of WWII. The assassins had hoped to assassinate Charlie Chaplin as well, who happened to be visiting the prime minister’s residence that day, but he was coincidentally attenting a sumo match with Inukai’s son at the time.
But yeah. That was basically irrelevant. 
I confess I’m not a huge fan of Akane treating the fact that Inukai ate the chocolate herself as absolving her of any wrongdoing. It’s not like she actually made any attempt at stopping her from eating the chocolate. (Actually… that’s kinda like Willy Wonka telling Violet Beauregard not to eat the three-course-meal gum because it’s still in testing, then just shrugging his shoulders when she actually does.)
I looked up たんげ on page 83 because it confused me. Results of my findings: it’s Aomori dialect for とても or すごく.