Brothers.
Brothers have always had a tendency to protect their sisters older or younger which is why none of Rose's, Lilly-Luna's, or Roxanne's dates were ever surprised when they were cornered at any of the three houses. Like the one night they all happened to have a date the same night.
Scorpious was early. Witch helped Hugo a lot. I know what you're thinking you would rather deal with Hugo than James or Fred. You would be wrong. Hugo might be small but he has a big temper and the entire family on his side he says jump they say how high. Figuratively of course Hugo might have power but he would never use it. Unless you hurt his sister, or Lilly but that's just a family thing anyone would through a punch for Lilly.
"You hurt her I kill you." He stared across the small coffee table at the blond.
"I know."
And that was that.
James was harder to talk with seeing as he was, well, scarier. He can do the damage of the entire family the quittage team and both bludgers in five minutes. So that is why Lysander was scared. James popped his neck in a way that his mum and dad would pass of as casual. But Lysander knew was a silent threat. 'You hurt my baby sister and your back will make a sound like that.' Al, however, trusted Lysander more. He simply gave him a look saying 'Don't mess with James and don't hurt her. Or I will hex you until you don't need Spectrespecs to see Wrackspurts' So Ly knew to be careful.
Fred is scary on a level that none of the other boys could accomplish. He could ruin your life with the right word to the right person at the right time. And he had a knack for being in the right place and he knew a lot of people and even more words. So the random Hufflepuff that had caught Roxie's attention wasn't very scared, seeing as he had very little life to begin with. But the other way he was scary was impressive in a way. He had access to the largest magical joke shop on this side of Hogwarts for little to no pay. So when the younger boy sat down and felt a cold chill up his spine and was temporally unable to move then he was scared.
Though, from Hugo to Al to James to Fred, I have to tell you the truth. As bad as the brothers might be, the sisters are worth it. So take the risk I here Roxie's still free.