He listens intently, feeling his heart swell from the emotions that Lan Wangji's vows give him. He doesn't know if his are even going to come close to comparing but they are from his heart and that is what matters.

"I love you so much, Lan Zhan. I don't know how I ever got so lucky as to have you love me, despite everything we have gone through in our lives. No matter how terrible I have been, or how much trouble I have gotten into, you have always been by my side. Even when I didn't see that myself at first. I want nothing more then to be the one that is always by your side from now on, for this lifetime and the next. For the good and the bad, I will never leave you and I will do everything I can to protect you, love you, cherish you, and make every day more memorable then the previous one. There is no one that makes my heart feel more full and content, that makes me feel more alive and more loved, and I won't let anyone try to take you away from me. You are my everything."

Wei Wuxian finally closes his mouth then opens it again as he laughs softly, "And I'm going to stop before I can't stop and we never make it out of here. Because I could scream my love for you for hours."