It is about how u look or think about at that point ?
For me loving or to be interested in ladyboys is not a gay thing, true gay people like men but ladyboys are not men, they look like women and think like women (except some situations )
But we can say u r bisexual or pansexual (search google) because u want to suck a dick and sucking a dick is not a straight thing. But you can say that LB's penis is just a pleasure point and i don't see it like a penis, it is a pussy for me which i want to lick.