In most manga about boys-girls relationships there's lots of situations of when boys are being beaten hard by girls. He caught a glimpse of her panties - SMASH! He said something which is easy to misunderstand - BAM! He just happened to be in a wrong place at a wrong time - CHOP! He didn't feel the mood - Narusegawa triple-punch combo!
Mahou Shoujo Neko X doesn't break this tradition, instead, this manga reverses it. Now the boy gets to beat the girl for the very same reasons. He caught a glimpse of her panties - SMASH! She looked at him seductively - SLAP! There is a deeper cause for his actions, but it is uncovered only in the end, and until it does, you get to enjoy the punishments he's giving her. Yea, I know, tastes differ. So if you don't want to see a cute catgirl suffering, don't read this manga. But if you do want - it's your thing.
Putting aside the violence and relations stuff, on the whole it's just an ordinary manga about a girl fighting antropomorphic animal monsters, while protecting her master. Don't be deceived by the title - she is not a mahou shoujo, it's just that her master wants her to look like one when she is fighting, and there's several jokes related to it, nothing more. There's lots of ecchi stuff (but no hentai) here. The fighting scenes don't last too long, the accent is more on the main characters' relationship and on the amusing situations they get into. It's pretty fun to read, but 2 volumes end too quickly =(
And it looks like it's the only non-hentai manga about a catgirl being dominated by a boy. All those smut titles are too shoujo, pages filled with feelings overflowing and hearts doki-dokiing. Most of the others are either girls-on-top or boys-should-protect-girls, or both. Or just neutral. This manga looks like an experiment of "what if we reverse it, what if a boy is on top, and a girl is protecting him?" I'd say, the experiment is a huge success, and I really want to read some similar manga. Unfortunately, looks like there's none...
P.S. So many fetishes in one manga! Catgirls! Collars! Submission! Humiliation! Yaaay!