You've traveled through time, and you have a ghost substitute.
The ability to be a substitute is just like the name. She can make the people in Jo's house and Araki's village across from you lose their rationality and turn into OOC characters in Jojo's Otome Mary Sue and the male Xiangguang's harem fan novels who say earthy love stories about killing Matt. And the only way you can save yourself is to abandon your shame, and in a sober state, talk to the other person in a crude way.
Intention: Just make a fool of yourself and be done with it