Marek | Melinda
It's a duty. I do things that are better than the alternative for the Dark Lord all the time, this is the same thing. I have a duty to have a hand in bringing up the next generation of purebloods. As long as Alec is here, I can do that without worrying that I'll be pressured into it before I want to or that my husband will try to make me do or not do this or that or whatever.
Plus, I'm not brave enough to defy our grandfather any further than that.