Of course, you can't rule out the possibility of making a straight man Bai Wan (that is, making heterosexuals like you), but not for everyone. Although 98% of men are gay at birth, and most people become heterosexual because of acquired education and social and moral factors, 100% straight men still account for the vast majority. It's not necessarily100 & that straight men who are easy to become Bai Wan; Straight men, they just don't realize it. In a word, you need to think twice before telling the truth to Bai Wan, and the ending is likely to be a tragedy, so you should have the courage to bear it. If you don't succeed, I'm afraid sometimes you can't even be friends.
On the issue of AIDS, this is still seen on professional websites. It is true that anal sex may spread AIDS among comrades, but one party should not infect the other (this is my own understanding). About homosexuality and AIDS, I always feel too demonized.
Most parents will not feel good if they know that their children are gay. First of all, student A should know more about himself and how to go in the future. Come out (admit your homosexuality) or hide. This society is not inclusive enough, so it is very important to think about how to go in the future. If you want to get out, you must first do your own psychological construction. Actually, I don't know how to answer this question.
These are just some of my own opinions, which are wordy and I hope to help you. I wish A happiness and everyone is well.
Ps: You can visit Aibai.com/.