For people still stuck on this basically run around and have sex with everyone you can twice. After this go to the bottom left part of the forest and the spirit will appear there to give the MC the spirit seed after getting it show it to the gatekeeper in the cave to access the demon lord and seed her twice and also go to the castle town and show it to the guards and then seed the Queen twice. After this go back to the forest and talk to the spirit again who will then teleport you to a closed area that works as a gallery while thanking the MC for destroying the world and as a thank you he can have all the women in the gallery, the end.
An easy way to see if you have gotten everyone is to use the magic plant in the forest and then run around to have a look since once you have seeded someone they and anyone close by turn into a plant so if there are ppl walking around there is most likely someone to seed close by.
