1) You need to save Ste the minotaur the day after you've saved Korg the orc from Vicoria the succubus in the river's cave, after that you go to the forest path and the path to the farm is open.
2) No there are only sex scenes with Othra and/or Roushk and after with Roushk during the bonding event.
3) During the celebration if you have both first hearts.
4) After going with him to the temple, you can agree to be his slut.
5) I don't know but for now similar to dragons we have lizards, as water creatures we have the murcads and similar to birds we have harpies.
If you need more information check my fan-made guide by clicking on my name and than check creator page, or ask here.