This pose is made with a min height Midlander fem on bottom and a max height Highlander male on top, any other races, sexes, or heights will likely need a decent about of editing by the user to remove clipping.
As for permissions - Once you have the pose it's up to you on how you want to use it, I don't mind if you credit or not just have fun with it - Full permission to use this as a basis of your own pose - Feel free to edit however you see fit