"Allergy-proofing" apt for boyfriend

My new boyfriend is allergic to cats. I have two of the little darlins.
As silly as it is to say, we're getting tired of hanging out at his
place all the time. He wants to come over but we're both afraid after
ten minutes he'll start sneezing, etc, and it'll be a disaster.

Is there anything I can spray, whatever, to lessen the chances he'll
feel crummy once the dander get to him?