Oral caresses always make sex more sensual. Many people are scared of them or perhaps consider them something shameful. But you should look at the girl and realize that another way to give her sensual pleasure has not yet been invented. Of course, it's up to everyone. But I made a choice for me. And the cheerful smile of my partner tells me that I was not wrong in my choice of caresses.
Now that's what I call a real brother-sister relationship - they're a team! And they were foolishly burned, because the sister at the end asked aloud if he came inside her. And so - all the movements are honed and memorized - it is obvious that they do it not the first time.