She knows she’s pretty and dad can’t resist
Conversing is something that people do to communicate, this skill also serves many purposes. We would not be the same without being able to engage in conversations as complex as those we humans have. Although what is said does not always have to do with what is meant, as in this case the girl just wants to flirt. And her father, seeing how pretty his daughter is, can’t resist. And she doesn’t do it, since she has no way to do it, because the young blonde is in charge of giving her a blowjob so that she can then fuck her pussy.