Manga is Oshi no Ko Chapter 143. The joke is that the chapter features a double spread of an exciting sibling incest kiss, officially released exactly 1 hour before this art was posted.

LQ said:

Manga is Oshi no Ko Chapter 143. The joke is that the chapter features a double spread of an exciting sibling incest kiss, officially released exactly 1 hour before this art was posted.

They sure worked fast

Thegreatteacup said:

They sure worked fast

Spoiler picture was on the net few days before