When you have some in the ruins, you should have to plant glowing mushrooms at home to have more and faster ...
You will never have Roushk alone anywhere, Othra and possibly Rhot will always be there.
On the other hand, you can invite Roushk and Othra to watch the fireworks with you if they have at least one heart each one of them and you form a couple of three/"threesome" - "mmf" =(they are both bisex).