I’m genuinely confused about some people’s reaction to this chapter. Denji’s unhealthy relationship with sex has been a consistent theme in the series. A prevailing theme is his constant manipulation by women (often older or in positions of authority over him) through sex. His sexual experiences have mirrored the general problems he’s had in his life with him being constantly being used by others and his lack of control in the direction his life is going.
I actually find it really interesting that Yoru’s advances of Denji are some of the few times that someone else has expressed interest in him without ulterior motives other than intimacy and with someone who is about his age and position. Obviously, the consensuality of it is highly questionable but nonetheless still reflects Denji’s general problems with control in his life.