My 4yr old meeting gay cousin

Hey girls! So to start off since we’re speaking on the subject happy pride month!!! I have a cousin who is gay and she means so much to me, I’m going to her house on Friday after a year bc of the pandemic.. things were rough out here in miami and with pregnancy and now a NB and all that we just preferred to wait to see each other, on her part too. She has a gf who she resides with and last time my little girl saw her she was 3 and she was just oblivious to many things and never asked about much.. now she’s 4 and extremely much more alert, she’s a little parrot too lol.. so my question is! What’s your advice on how to explain the situation and when.. before we go on Friday? Or when we are there in front of my cousin, like have a little short sweet explanation. I need advice ! :) I want her to know that love is love ! I’m just scared she says something like “ew” or something in front of them as she has very good manners but she is very blunt with her feelings at the same time which is okay