I just updated this last night. Check chapter 12, you might have skipped it. 

Luhan had first thought of telling Sehun 'no, stay where you are, I want to be alone at the moment' because he usually does photowalks alone. But he had decided that it would be rude of him to push Sehun away when Sehun is nothing less than the sweetest best friend anyone could ever find.

He sits in the lobby as he patiently waits for Sehun to arrive. In the meantime, he scuffs his sneakers on the sparkling black granite tiles and bobs his head to the bossa nova music playing in the background.

After a while, his phone beeps and vibrates in his pocket.

From: aaaaSehun-hyung!
Parked my car in the basement. On the way to the lobby.

Luhan keeps his phone and stands up, his camera strap around his neck as he protectively holds his DSLR in his hands. 

Sehun shows up a couple of minutes later, in black skinny jeans, a navy blue v-neck shirt and leathery black slip-on shoes. The white gold love bangle and the gold engagement ring sparkle with every subtle sway of his arm. The casual clothes he's wearing makes him look so much younger than he usually appears to be.

Luhan easily smiles, quickly forgetting about his previous worries and thoughts. "Sehun-hyungnim! Did you get off of work early? How are you?  I like your shirt!" A small smile quickly surfaces onto Sehun's face.

"Hi, Han." The older reaches out to lovingly pat Luhan on the head. "I did. I'd been really busy for the past few days but now I'm free." He grins when Luhan pouts up at him.

"Hyung, stop overworking yourself. You'll get dark circles under your eyes and you'll turn ugly!" Luhan scolds him. Sehun only shrugs, but the grin remains on his face.

They exit the building with Luhan fumbling with the controls and settings on his camera.

"Where are you going to take photos?" Sehun asks. He walks beside Luhan with his hands in his pockets and his thumbs jutting out.

"I was thinking about going to the all-womens' university and taking photos on the way there too." Luhan says, still tinkering with his camera. "But now that you're joining me I think we should go to the park. I'm betting they have ice cream and this time I'm going to make you buy me some."

He's only joking, really, because Sehun is already spending too much money on him. But Sehun throws his head back in a delightful laugh and that catches Luhan off-guard. He almost trips face-first into the ground. Almost because Sehun saves him by grabbing him by the waist and pulling him close.

"Careful, baby. I'd buy you all the ice cream you want but if you bre