The moment Saiki got a stalker, he knew about it. It would be hard not to, hearing every mind's thoughts at a distance of 200m. Not a pleasant experience, especially when it's something directly connected to him. Saiki prefers to avoid people who can't pass their day without deciding to bother him, aka have a conversation, but your case is a whole different sort of torture.
He already had an experience with Kokominzu—the cult-like "club" dedicated to worshipping Terurashi Kokomi—and he doesn't change his opinion that investigators of his psychic powers would be better stalkers than any sort of other psychos. Like Kokomi's brother, for example. Why is it always about her?
Well, perhaps because his main everyday goal is to avoid attention. Saiki does everything to appear average. Average built, average grades, average ranks, the list may go on. He doesn't understand why people cling to him. Terurashi's persistence ~(it's the third time she's being mentioned throughout the three short paragraphs, the lack of creativity is oozing from this sick fantasy garbage)~ can be justified by his immunity to her beauty, Chiyo's crush was, gladly, short, and Mikoto is...not a normal human. But then again, was there any normal person in the life of Saiki? The more the days pass, the more certain Saiki is in the response 'no'.
As the pink-haired psychic walked down the street, there were already about five ways he came up with to get rid of you. He could technically try to erase your memory that somehow provoked that strange interest because, despite all his abilities, he hasn't figured out how it all started. Yet. Sooner or later, he will, because he's not letting another oddball add more trouble into his existence.
Aside from that, it would be a big threat if you saw him using his psychic powers in practice, and it would be inconvenient to constantly suppress them when you're watching from afar. Only fellow supernaturals knew about his true nature, which is logical, and his family, which also makes sense. Humans who have no idea about the existence of something beyond the mundane? That would be too much of a burden. But then again, he doesn't know much about you for now. And he doesn't really want to.
"Yare yare...what now?" His eyes narrow when he senses the change in your direction. Just when he was about to fool you so you wouldn't get to know his address, you suddenly changed your direction.
"Don't tell me..."
After making sure no one is nearby, although he always uses the isolated areas as his route to have some peace anyway, in the blink of an eye, he's already in front of his house. His mother's high-pitched voice echoes in his mind, and so does his father's—
You were already inside. Great.
Why do his parents always have to let in questionable personas that obviously would never be his friends, despite claiming otherwise?
"Ah, Kuu-chan!" The woman cooes as the door opens, showing the expressionless face of the psychic. He doesn't speak. He most likely wouldn't. "You didn't tell us you were bringing a guest!"
Because he didn't.
"I'm so proud of you for being so social, son!" Saiki is absolutely not getting any more social.
You are squeezed awkwardly between his parents while the boy stares you down with his blank, tired eyes. Why isn't he surprised at all?
Then his gaze lowered. You brought coffee jelly. The exact one he buys.
But perhaps having a stalker wasn't so bad in the end?