Best childhood friend asked if i would mind letting him eat my cum

Few days ago one of my best childhood friends asked me for a favour. He asked me if there is a way that i would let him to eat my cum. Explained me that he need to consume it as a non-traditional cure that a healer promised to help him solve some kind of anemia(not 100% sure it it was anemia), but it’s releated to his blood and he cannot cure it with pharmacy and modern medicine. He told me that he gets beter for a while and after it came back. He asked if it’s possible to meet up to 3 times per week and to jerk off and drop it in his mount directly. Told me that it should be still warm when he eat it. Tha’s weird enought but he mentonied that if i want to he can try to read and learn how to do blowjobs, so at least he can give me back some pleasure.... I really have no idea what to do. I know him for ages, and we never had a fight or so. When he spoke to me he sounded kinda like devastated and sad. Probably he doesn't feel good about having to eat someone’s semen. I really have no idea what to tell him. And i am not sure that he will get better if we start doing it. So please tell me: Is it normal to help to a friend in that situation? Any advices would be appreciated.