Seojin stared at Dongwoo shuddering and twitching. And then, he looked at his hand. He couldn't tell what was more lewd, if it was the spanking or Dongwoo's reaction.
He never wanted to go so far with Dongwoo because Dongwoo was scared of pain but he did it subconsciously. His butt cheeks were always so tempting but he had been able to hold himself off for so long.
So, that feeling of spanking his ass woke up the sadistic side of him. It was dangerous. He... He wanted to do it again.
Slowly, Dongwoo turned his face to Seojin, his teary eyes showing just how much satisfaction he got from his ejaculation, though he very much wanted to deny it.
It was a feeling he had never experienced before so his body wouldn't stop twitching.
"No... No more." He said. "No more accidents. Don't spank me anymore. I can't take it."
Dongwoo was confused.