Only a man or two was in glipse of sight in whole K-on. It would be unnatural if there was no yuri about it. And although I'm not into yuri much myself as a man... I'm glad I've read it. On another Baka to Hasami doujinshi someone coined a term "heartcatch" as a tag to describe a touching story. I call it heartache.
Edit: Thanks to Oneof8000men, unnatural not in- . Shameful of me >_<