She saves his life and starts riding his cock
If a person is about to die and you interfere, at that point you are completely responsible for what that person does. You have literally taken a client away from death and now you must take responsibility. That’s more or less what this girl does, although not exactly like that. Well, what she does is that since she saves his life, she takes advantage of the fact that he is grateful and then starts riding his cock. It seems that no one does anything for free these days and after she gives him a blowjob to get him excited, he has to use his erection to please her sexually.