>>52279165They are not your oshi.
"Oshi" does not mean "a member that you like" unless you're on reddit. It means "the member that you push" and thus the one that you lend your support. You're allowed to like other girls, but your oshi is the only one who you should actively support.
If you push or spend money on someone who's not your oshi, that's an oshihen and you should feel ashamed for not reciprocating your oshi's devotion.