The correct answer is a metaphor. A metaphor is a figure of speech that uses something to refer to something else. Usually the two things are quite different things but their qualities are somewhat similar in a literal or figurative sense. In this instance "a radiant star" is just a giant conglomerate of burning gases in outer space and "love and brotherhood" are a human emotion and an ideal. However, our sun is a radiant star and it gives us warmth and life and love and brotherhood irradiate human beings with emotional warmth and life and that is why the metaphor is accurate.
It is never too late to back out or say no. If you feel uncomfortable, let your partner know. Even if you have just started the process, you can stop at any time you want. Never feel pressured to continue. If you are with the right partner, he or she will respect your wishes.