Freaks me out a little. I'm about halfway through the manga series (Yue just accepted Sakura). There seems to be a lot of glorified homosexuality, trangender fun, incest, huge age discrepencies, and paedophilia. I have nothing wrong with the homosexuality or transgender parts (they're typically quite funny). The incest part is a little weird, but mostly overlookable if you don't overthink it (Sakura's bff Tomoyo has a huge crush on her, but is also her cousin). The paedophilia is between a teacher and a student... actually, a few (Rika in Sakura's class and her teacher, Toya and Mizuki, and Sakura's dad being 27 and marrying her 16-year-old mother). The Rika part is probably the freakiest. It seems like her teacher might even return her affections (he calls her lovely and gave her a ring, I think)... but a 20-something teacher loving a 10-year old is more than a little uncomfortable.
That said, interesting story so far. I had to read CCS because all the other CLAMP literature keeps having the characters appear (xxxHolic and Tsubasa Reservoir Chronicles). It's cutesy, and despite all those... "off" themes... it's all innocent so far. I guess we'll see; I doubt we'll be seeing some mad lovin' going on between school kids and teachers any time soon.