Based on Chen declaring that pink is his favourite colour in EXO's First Box ep 1(4:46). Also Yixing and Jongdae aren't dating in this one. Plus double update because comeback is upon us. 

Jongdae wasn't lying when he said his favourite colour was pink. He didn't care what people thought, it was a nice colour and he liked it. He had a few pieces of clothing, toiletries and bedding in various shades of pink and the members knew that, they had long since given up on teasing him about it because they never could get a reaction out of him.  

But what the members didn't know was that Jongdae had fancy pink underwear. They were his secret indulgence. In the dorm, backstage and on stage, there is no privacy, so he always wore boxers so no one would suspect a thing. He didn't want anyone to find out, it was his little secret and it gave him a little bit of a thrill. He'd only wear his pink when he was sure there were not too many people in the dorm or when they were on a long break or having lazy days in.

Today was one of those rare days that EXO had off. Everyone was either sleeping or out doing their own little things. When Jongdae woke up, he noticed that his roommate was also out. He quickly hopped out of bed and listened for any signs of people nearing his door. When he detected none, he pulled out a pair of pale pink from its hiding place and stripped out of his boxers. He had just wiggled into said when the door was flung open and there, at the threshold, stood Yixing.

Jongdae was frozen in his place. Yixing stood at the entrance for a moment longer before he closed the door and stepped inside the room. Jongdae could feel his face burn from the intensity of Yixing's stares and tears were beginning to prick in his eyes. Before he could open his mouth to explain or to cry, Yixing took a few step and stood right in front of him. He then hooked a finger around the waistband of Jongdae's , causing the younger to gasp and hold his breath, before letting it snap back. The sound resonated around the room and the skin around Jongdae's hips stung pleasantly.

Yixing leaned down to whisper hotly in Jongdae's ears making Jongdae jump slightly. "Nice ." His husky voice made Jongdae shiver. "You look cute in them."

He pulled back to smirk at him and Jongdae just stared with wide eyes and a gaping mouth. Before he could ask Yixing not to tell any of the members or ask him what the hell just happened, Yixing grabbed his headphones and headed out the door. Jongdae finally let out the breath he was holding but he knew his face wouldn't return back to its original colour any time soon.