Temporary trap male cat to prevent unwanted grand kittens

This is taken in the morning of 24 September 2020. Where I have to resort in trapping this stray male cat. In order to prevent unwanted grand kittens. As he keep mounting on my Furball.

Have to keep him in the cage until Furball came back home. It is the only way I could think that morning. Since Furball refuse to come to me when being called. But I do make sure to feed the stray male cat. Need to make sure he will be good to me also. Easier to catch later if needed again.

I let him go after Furball is safely kept inside her room.

Till then, be creative in preventing unwanted grand kittens at home.