A shot of the best and most wholesome girl, Emily, marry her already and make her the main wife MC.
Ryouta suddenly thinking about his harem (I dunno why gay guy is there, my bet is that gay guy will magically turn into a girl and join Ryouta's harem).
Second wife (Celeste), and main wife (Emily), properly exerting their dominance and sending a clear message to the bitches: Ryouta is theirs.