Open with the most disgusting picture and if she reacts negatively you can call her a transphobic bigot. "Don't you realize how stunning and brave and beautiful this is?"
Knowing this pics came from 4chan I'm guessing at least one front hole has maggots.
Send your aunt some pictures of post op trannies so she can truly understand how stunning and brave they are. I don't mean porn with post op trannies I mean videos of the oozing mess now properly called "the front hole" and all the work these victims [1] go through to keep that wound from healing. Maybe you can even find a video of the genital mutilation she is so in favor of.
[1] They are mentally ill victims. Victims of libtard parents like your aunt. Victims of library story time with trannies. Victims of a society that wants to virtue signal off their destruction instead of offering them actual help merely accept the body you have without mutilation. Such horrors committed in the name of tolerance and diversity.
Suggest your first date be a trip to a gun range. If she is open to it maybe there is a chance you can cure her libtardation. If she freaks out she'll stay away from you forever.
Or maybe she'll report you as a terrorist. Yeah, in hindsight you need to break all contact.
This is a spicy comeback!