((If I offend anyone, I'm sorry, it wasn't my intention. Also gif credits to owners))
Minseok: He hears you singing Chen's Beautiful Goodbye, and is mesmerized by your voice. He would walk up behind you and pull you into a back hug, a loving grin forming on his face. "Jagi, your singing sounds amazing. But I bet you would sound even better singing You." Needless to say, he just loves hearing your voice. Even if it isn't his lines or songs.(( Imagine you are Chen))
Luhan: Manly man Luhan would be having none of this. He wouldn't want anyone's songs to be covered by his bf/gf. So when he hears you rapping along to Juice, he would instantly get defensive. "Yo, Kris! I told you to stay away from my baobei! What do you mean you didn't do anything? How else would you explain my y/n rapping along to your songs? Hah?!
Yifan: He would be chill, he'd probably find it kind of hot when he hears you rapping along to Tao's K.O.C. "Wow Baobei, you're pretty good with keeping up. You know what they say about fast rappers, they're pretty good with their tongues~" Despite his chill nature around you, he would hold resentment towards Tao. Making any situation they are in together awkward.
Junmyeon: "I thought jagi loved my ballads?! S/he is always talking about how much s/he loves Curtain, I even catch her/him singing all the time. Now s/he is all about Lay and Boss. I hope s/he doesn't think of Lay more than me. Is that what s/he likes? Rap? I can rap. I'll get better at rapping and then s/he won't leave me." Please reassure this baby as soon as possible.