How is he a Beta?

Hae-won agreed to get on Baek-Hyun's back since he was feeling a bit exhausted and he'd need to get to his part-time job soon. But he felt it wasn't right. 

He was sure they were also hard and having a hard time but they didn't do anything about it. Why was he the only one who got to relieve himself? 

It made him feel they were giving in to his desire rather than theirs.

"It's not fair." He muttered as he unknowingly fell asleep on Baek-Hyun's back. 

Hae-won dazed off at work. He swore he would quit but there he was, serving customers. And he was doing a really bad job at it.

He couldn't get the day's events out of his head. 

Woo-Bin's expression while sucking him off, the ecstasy he felt and Baek-Hyun kissing him. He was such a good kisser.

And he could still feel like their lips were locked. His hands sliding up his chest and massaging his breast… He couldn't help but flush at it.