
Take the boy out for a lovely walk in this adorable sunny day,
:) I would def arrange for the boy to maybe go to someone elses house for a few weeks until her season is over, its not fair on him to be so frustrated not being able to do what nature intended! :) And the scent of the season bitch will linger through the house no matter where you put her, and he will get more and more frustrated.
I would say let the boy try his luck with her, but if she is not willing to stand for him then he will find this frustrating too, and keep trying until he gets what he wants! Has he only recently been castrated? I know male dogs still do get the erge even after castration, but just wondered how long ago it was.