Welcome to the world of yanderes and yangires, who show their "love" in quite the "passionate" way.
And yeah the proper response meeting one is usually calling the police or the local super hero...at least if YOU are the focus of their interest, Yukkuris, on the other hand, lack such advantage.
Would have liked to see more stories with this fem anon. I have no problem with the sharp-teeth onee-san, but there could also be some interesting stories about this character's abyuse methods. Nice work, BTW.