((if I offend anyone, I'm sorry. Gif credits to respective owners)) I don't know how to describe this but it's like saying sweet things to them, thinking they are asleep. Yeah
Minseok: " You make me feel like the most special guy/girl in the world. I could have never asked for a better boyfriend, my baozi boyfriend who I love so much." Your words would cause his happiness to explode but he knows if you are telling him while he's asleep it must be something you struggle to say to his face. So he will continue to "sleep" knowing your little secret.
Luhan: "Please know that you are the only man for me. The manliest man out there, and don't you forget that." He would be awake instantly, telling you all the sweet things he hasn't told you yet. " And one day I want to make you my husband/wife."Yifan: "Fanfan, you are my partner for life. Through thick and thin you will always be the center of my universe. Thank you for being my shining star." He'd wait till you were asleep before he'd say all the things he's ever wanted to say to you. "You make me...me. You are a part of me as I am you."