Nope! Both the characters don't necessarily have to be Bi, only one of them. should mention cross ships are fine as well as long as one of them is a hoyo character if you're shipping them with a non-hoyo character - ☄️
zhongli telling venti “babe it didn’t mean anything ” while he reincarnates his first love zibai, love bombs guizhong, leads on azhdaha, flirts with furina, texts the tsaritsa “u up?” at 3 am to make 𝒸𝑜𝓃𝓉𝓇𝒶𝒸𝓉𝓈 with her all while spending hutao’s money