What anime do tu want to crossover with K-ON? But it has to be only anime Serialized under manga Time Kirara.

sorry nothing coming to my mind..........he he he h

Acchi Kocchi, is one that was serialised por manga Time Kirara and it was an anime that I actually really liked, as well, so I'll go with that.

In saying that, I'm not sure about combining a romantic comedy with a highly unsexualised música anime. XD