Because these chapters are not yet out, exact plot details are unavailable. However, based on the ending of Chapter 79, here is what is expected for the upcoming release:
Haruka toma el pincel, su mano temblorosa al principio, pero luego firme. Con la primera pincelada, la tinta roja se extiende en un trazo que parece una onda, como si el río bajo sus pies respondiera al gesto. fuufu ijou koibito miman manga capitulo 80 81
Recently announced as returning from hiatus, with work officially finished. Fans expect this chapter to focus on the immediate aftermath of the "marriage practical" ending and the couple's transition into their public relationship. Turning the Tide: How Chapters 80 & 81
Fuufu Ijou Koibito Miman Manga Chapters 80 and 81: A Deep Dive into the Latest Developments Status of Chapter 80: Recently announced as returning