You were scared of spiders, they creeped you out, and aizawa knew this well. You would always come to aizawa’s room and annoy him, and he was tired of you constantly nagging him for no reason, so he decided to get a temporary pet spider in a cage and put it in his room. This way, you would hopefully leave him alone.

It was Saturday, so you decided to go to aizawa’s room. Aizawa knew you were coming, so he put the spider on a table near the door ready for when you walked in.