In which episode did I consummate my marriage so many years late?

Episode 4.

I learned about the 4th episode of "I've Been So Many Years Late" from SouShi.com: Qi Fei played with Yoyo for a whole day and sent her back very late. Unexpectedly, the two of them went straight to have sex with each other. I checked into a hotel room and spent a lingering night.

"I'm So Many Years Late" is a TV series directed by Zeng Qingjie and starring Xiao Yu, Cao Enqi, Xiao Ranxin, Wang Junhao and others. The play tells the story of underwear designer Jiang Xile who unexpectedly reunites with Ding Ran, his crush from ten years ago. The relationship between the two continues to change from childhood sweethearts to doctor-patient to reorganized family, and the love in their boyhood is restarted again.