Ok it was just an example and of course we will see fuckboi and Sakura having sex again and you are likely right it will be next chapter. Because of course she would give us that instead of more fu I sex.
I think after we see the 4 of them having sex,i think the drama will start and we will see more of Shinobu and Sakura's POV and obvious they will meet somehow to start the big drama about everything.
i can see the trying author to do something to make us think they'll be back together or properly make them back together for real.I think is possible that the author sacrifise Fumi and Fuckboi for the sake of the main couple being together(plot armor power)
I saw many jp fans suggesting that the author will "tie" the 2 of them because they made sex with other person to make possible both of them getting back together(with THIS AUTHOR is possible to happen tbh).
For me we will see some sex moments for now but after that we will see some big drama to happen for Sakura,Shinobu,Fumi and Fuckboi.A bold prediction is that we will see fuckboi trying to do something to try to destroy Shinobu's carrer.