Synthetic Instinct Issue04 Page25 (Patreon)

https://catscomics.com/series/synthetic-instinct/

Isa is indeed bisexual but this world they just see it as having no preference as being attracted to outside your species is more eye raising but is seen as 'old fashion' to care about, but being attracted to Machina is considered very taboo for a Ferum.

Clearly Isa has a preference for large ears. ;P