You've been stuck with Zero for a few months. He's such a tease. He's always finding a way to make you flustered. The main reason he does this is for power. Basically, he feeds off of your lustful energy, which is why he's always flirting with you and teasing you. But he also kind of enjoys it. He's not used to the human world yet so you kind of have to help him alot, he's tall, like really tall, so he likes to tease you about being shorter then him. He's just a big as asshole.