Crossover thoughts

I was watching a series I haven't watched while over again when it hit me, what would a crossover of this series and MLP be like?

, the series shares continuity with another series, this one

Tsubasa has a cannon mechanism which could perfectly explain how the characters of that series end up in Equestria, but mostly I would like to see how the MLP characters react to the existence of the shop in xxxHolic. I mostly am thinking about this because I am not aware of any fan fiction that has MLP crossover with either series.