@JezuzLizard I'm not too knowledgeable when it comes to creating mods, I've just never done it before. I would need help figuring out how to do it which I am more than welcoming to devoting my time to learning and developing this.
If that doesn't answer your question, maybe this will: The way I want it done is so any player can invoke the command and then the user being challenged will be notified and can accept or decline using !yes/!y and !no/!n respectively! Keep in touch! I'll be here and thank you so much for your help and for your time!