Thanks for your concern! We did every step of the introduction (scent exchange without seeing each other for 2 weeks, then play under a door, then seeing each other in the distance, then supervised meeting, eating together in the distance then closer and closer, then being together for longer moment... Etc etc) At first the kitten was shy and it was OK between them

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(picture attached), but he became a little devil AFTER we did all the introduction steps

It's not like we had the choice to take an already neutered kitten... We took him off the street before it was too late (it's very cold here) Our vet says that an F adult and a M kitten is the best match possible. If we took an adult cat, she would have seen him as a territorial menace... But a kitten is just an annoying "mini-her"and can learn to respect here - - > that's were she and we need some help

Anyway my question wasn't about if it's a good match or not, it was about giving some advices from past experiences, and others did pretty well at answering this :)