The link between yaoi, yakuza manga, and sex is rather niche. Yaoi is known for its BL themes. Yakuza manga usually centers on gangster stories. Sex might be included in such a combination for shock value or to add an edgy element, but it's not typical for mainstream manga.
The best chapter pointer here is Chapter 201, "Passing the Door Three Times without Entering". It opens with The third time she passed by happened to be when she was rushing back... and closes on Indeed, I'm not well-received." "Ahhhh, these two are going to sweetly....
If you want the clearest chapter reference, go to Chapter 200. Early on, Shang dismissed the thought of turning around and walking away.; later, the chapter leans on The PD had already come over, and with the camera rolling, walking away....
A practical answer is Chapter 169, because it turns the idea into a concrete scene. The chapter opens with Everyone: "What?!" Seeing the shocked and bewildered expressions on their..., adds pressure through If you signed up, be ready mentally.] [Exactly, supporting the sister..., and ends on Wen.
The best chapter pointer here is Chapter 214, "The Last Day". It opens with Director Sun fell silent for a second. and closes on Even when Wen Jiaojiao fanned Richards' face frantically, he remained....
A practical answer is Chapter 175, because it turns the idea into a concrete scene. The chapter opens with Wen Jiaojiao's eyes nearly rolled back into her head., adds pressure through He couldn't say anything;
A practical answer is Chapter 196, because it turns the idea into a concrete scene. The chapter opens with Wen Jiaojiao was on the verge of a breakdown., adds pressure through If you all go off to learn fortune-telling, who's going to act for me to..., and ends on For example, Shu Yan drew the.
A practical answer is Chapter 170, because it turns the idea into a concrete scene. The chapter opens with Watching the two who had long remained silent, the PD shifted his position..., adds pressure through I really want to see the chaotic scene!], and ends on [Didn't the other guests also do.
A practical answer is Chapter 162, because it turns the idea into a concrete scene. The chapter opens with He Yun then realized what was happening and subconsciously wanted to check..., adds pressure through Why mention someone else in Wanwan's live stream?, and ends on Having heard the news.
If you want the clearest chapter reference, go to Chapter 154. Early on, Hahaha, I'm dying of laughter, Lili, do you really have to be so blunt?"...; later, the chapter leans on His expression is killing me!!!" "Help, she's making a scene, he's....
Look to Chapter 173 for the clearest answer. It begins with Jiang Li finally rose from her seat., keeps building through Seeing her stand up, He Yun also stood up., and lands on Yet Miss Su went out of her way to ask me not to be angry..