I just imagined Suika going on her first date after humanity is revived and the KoS going into panic mode like they can't really do anything about it, she's an adult now, but that doesn't mean they have to like it. If you ask them no one would ever be good enough for their sweet little Suika.
The only thing they can do is spy on the date. It's at a super fancy restaurant so disguises are definitely a must (That's definitely Gen's idea)
There's a stage at the restaurant so Gen definitely disguises himself in a beautiful dress and gorgeous wig, thanks to Nikki's training he can sing Lillian's songs and take on the role of a Lillian impersonator.
Yo who is surprisingly good with instruments takes the stage with him.
Francois takes over as head chef, but also insists on taking the food out to a certain couple.
Ryusui is there on a date with Ukyo, they would have Tsukasa with them too but even with a disguise he might be too easily recognized.
Senku makes Ryusui swear to video Gen's performance because he can't be there himself "sorry Senku-chan but your hair is too attention grabbing and it definitely won't fit in a wig cap."
Kohaku is there disguised as a bouncer of sorts.
Kaseki is there with Ruri and Chrome, they are disguised as a newly married couple telling Chrome's grandfather he's gonna be a great grandfather.
Either of them are ready to throw hands if the date tries anything Suika doesn't like.
Senku and Tsukasa have dinner together at the restaurant down the road being sad they can't be with their lovers too.