manga said: or was it "Shake. Stir. Thank you, sir?"That's the way I've understood it. *shrug* They could have have tried "a few weeks, months or years at it." It was not explicitly objected. But now I wonder - wouldn't it have been mentioned at least once if Go-Back females have a cycle - specially after Krim lived with the Wolfriders for centuries? They mentioned the great stir it made each time with Shuna and the wolves.