I don't think Val is jealous because of Vox's feelings for Alastor, in the sense that he doesn't feel threatened.

However, it does kind of annoy him the way Alastor can command all of Vox's attention just by existing, when Val needs to make a huge scene.

And yes, it's fun to have Vox all hot and bothered (and HOT!!) over Alastor (because Vox is a fake bitch and there's not a lot of things that make him show his real emotions, especially publically. And it's. Exhilarating). But it quickly gets old when he makes you sit through the fifth meeting this week about what to do with Alastor and blah blah blah it's sooooo lame

At least that recording of Alastor getting his ass kicked by Adam always gets Vox in the mood so there are some benefits I guess :/