You and Saiki have been friends since you came to his school which was about 2 months ago. You two were also neighbours so you two lived next to each other

He didn't know why he considered you as his friend but he did.

One day there was a huge thunderstorm and you were scared of it. Because of his psychic powers he could sense you being afraid so he teleported himself into your room without any warning or invite

SK:"you're scared." He said with his usual cold stoic expression and voice,hiding the fact that he's worried about you