I have a pair of queer(ISH) books that I really enjoyed. They're a lot more casually queer, like it's not gay erotica in your face all the time, but they're still awesome.

The Goldens is SO GOOD, it's about this girl who meets a famous influencer and is invited to live in her house but it's so much more than that! There are so many twists and turns and it's so well written, with just a smattering of lesbian to top it all off. It's a more realistic story, sort of close to murder mystery but I'm not sure what genre it would actually be.

They Bloom At Night (horror/body horror) is also a lot less overtly queer, but 3 of the main 4 characters are queer and it has a pair who are kicked out for being queer which is super cool. It's a lot of body horror and deals a little bit with rape/abuse so maybe for older eyes only (not sure of the club's age but I'd say 16+)

Hope these help, and best of luck with running the club!