How can i use multithreading in discord.py?

I've recently tried doing some image generating with craiyon's API, and send the image through discord.py, But i realized that it takes a long time and it would stop the entire bot from working all together. I tried to implement multithreading, but i had no way to send the image back inside of the class i instance using threading.Thread()

Code:

class message_del:
    def __init__(self, message):
        self._message = message
        t = threading.Thread(target=self.images)
        t.start()

    def images(self):
        if self._message.content == "$image":
            generator = Craiyon()
            result = generator.generate(self._message.content)
            result.save_images()
            self._message.reply(file=discord.File("generated//image-1.jpg"))

@client.event
async def on_message(message):
    message_del(message)

with it i get this error: RuntimeWarning: Enable tracemalloc to get the object allocation traceback please help

I tried adding async and await to the class, but __init__ doesn't return take async then i tried ditching all of this and creating the image then sending it through another function, but that didn't work cuz of the async stuff. So i got stuck.