basically he would be a foreign exchange student and he is staying at either her house or gisselle's house. and when he first came to the school, sixtine had a bit of a crush on him because accents are so perfect really. however, that ended pretty quickly because all of the other girls in the school were falling over him and she can't stand to like someone who everybody else likes. when she had the crush on him, he didn't even realize it because it was the way everybody else was acting but somehow when she stopped liking him, he took it as a sign that she likes him and so he still thinks she likes him and is always saying these weird cute things to him and basically she just screams inside because she thinks of him as a big brother/best friend. he doesn't have to like her or anything like that, he could just think its funny/cute that she 'likes him' and teases her about it.