Transfer Fortnite from one Ps4 account to another?

I don't play Fortnite but my brother. And on my PlayStation. Since this annoys me every time I want to bring my brother a different Ps4, where he can play on a different account. However, he plays Fortnite on my account where I have all other games from me. I wanted to ask how I can transfer this Fortnite account from one account to another, so that nothing is lost and he can play with the same Fortnite account on the other Ps4, but with a different Psn account.

Is it only fortnite and why is that annoying you, only someone can be on the PS anyway

Brother, if we have 2 ps4, my brother and I can play at the same time. Fortnite doesn't annoy me but that I can't play every time because he is on the ps is annoying. Therefore 2 PS4 THAT BOTH CAN PLAY A GAME AT THE SAME TIME FOR EXAMPLE I GTA AND HE FORTNITE! I'm sorry that this was so incomprehensible to you;)