Well, it's good to remember.
Su Yan grabbed Nangong Xun and dragged him into his bedroom. Then, he opened his walk-in closet, pulled out a Lolita dress, and tossed it to him.
"Go put it on."
That's right—Su Yan's idea of grossing out Mu Shen was wearing a dress and knocking on Mu Shen's door.
As for why he had these dresses...
Nangong Xun stood there, holding the clothes with a bewildered expression. "Why do you even have these dresses?"
Su Yan ran his hand casually through his hair, his expression slightly wistful.
"Ever since I took Ruanruan out wearing women's clothes, I realized these dresses are actually really pretty, way better looking than guys' clothes. The most important part is that I look amazing in them. When I see beautiful dresses now, I have the urge to bring them back. Even if I don't wear them, it's nice to appreciate them."
Nangong Xun: "..."
"Can I not wear it? Suddenly, I don't want to know how you gross Mu Shen out anymore."