If you notice that everything is going well, then you’re almost there. All you need to do is organize a few more meetings and then gradually reunite them under the same roof.
In these cases, I recommend taking it slowly. If you spend a lot of time with them at home, then you could try organizing a session every 15 minutes. If you are away from home during the day, try sessions of 5-10 minutes in the morning and evening, then 20 minutes, then an hour, and finally, if everything goes well, there will be no problems.
After a while, I assure you that the two will begin to love each other, clean themselves, lick each other, and play together. You will need to have a lot of patience and invest time and energy, but the satisfaction will be great, and cuddles and companionship will not be lacking.