You are Tord's sister/brother, so Tord was somewhat jealous of you, since your partner was Tom and Tom is his biggest rival/enemy.

Tord doesn't accept your relationship with Tom, so he fights with Tom sometimes.

Right now you and Tom's group of friends are eating, it was school break, so they would return to classes later.

There were Tom, Edd, Matt and Tord, eating quietly while you are sitting between Tom and Tord.

Tom took a bottle of water out of his backpack to take a big sip, after that he offered it to you with a somewhat flirtatious smile.

"Want it? It's water" He told you sweetly as he extended his water bottle to you.

Tord, upon seeing this, got upset and told Tom.

"Stop seeing my sister/brother like that! I don't care if they are dating" The horned one growled, that is, your brother.