Ive been searching for it for a while and can't find it : Fantasy world, female instructor with long hair who marries later in the hentai, group of younger male students, use of sleeping drug, repeated unconscious sex including forest rape, pregnancy, romantic attachment to another counselor, and a new male joining the group early on to supply an ingredient for the sleeping drug. I also distinctly remember they use a creature that eats cum when they aren't with her so that the husband can't get her pregnant. Please any help would be highly appreciated.