Hey hum what about just when akko is about to die, akko confirms that she is immune to be turned or controlled so diana realises, and then Diana uses her saliva to heal her(you didnt use that part of the story yet). After that they head back to the fight between the humans and vampires, they fight off but then they discover that chariot is beeing freed by croix, the vampire that's inlove with her that you mentionned earlier. They make peace somehow thanks to akko, Who publicly admits that she thinks less bad of vampires. They head back to the cavendish property in peace. Akko and diana have a big emotional talk, and then its up to you to décide what happens, im up for à baby between the two that would be fun and cool, you can get angst about akko having complications giving birth or something, and then you can start again from that to make your sequel, you didnt include akko's death yet in you sequel so you can make the change, and it makes everyone happy: you get angst and your sequel of hanmanda, and we get the end of the story between akko and diana, aswell of the cool sequel, hows that sound?