First of all, you have to understand that the best man's little brother is single. If he is single, you should go out with his brother more often. When playing, you can beat about the bush with your brother and call him the best man and little brother. Since you are the best man, you must have a special relationship with your brother. So you can sneak up on your little brother. Then use some small routines to make my little brother feel that you are a little interested in him but not too straightforward. It's best to let my little brother contact you actively, and that's half the battle. If the younger brother is not single (being the best man usually doesn't get married), then ask for more happiness.