Liu Yunlong did not touch Li Yi during the period they were together.
This was primarily so for two reasons: firstly, he had been taught not to and secondly, he had always been a traditional man. They weren't married, so it wouldn't have been appropriate to touch her, no matter how difficult it was to control himself not to.
When he had been drugged, he had hugged her tightly and desired to have her. However, she pushed him away forcefully and ran away. A woman came in then and he thought she'd come back for him. He called out her name throughout the night - he had been so happy! He thought Ning Qing had acknowledged the bright future he had ahead of him. He wanted to marry her.
Alas, the woman he'd been with that night was not her.
During the seven years that Li Yi had been absent from his life, Liu Yunlong did not once think about the events of that night. Now that she was back again, he found his mind drifting towards it.