Caught red handed.

I was doing some homework in my room when Jo passed by. We were having a casual conversation when I noticed him looking at a poster I have on my wall. He seemed particulary interested in it, so interested that I had to take a picture of him staring in awe...

...at Simon Neil (of Biffy Clyro)'s crotch. Here's a close up.

Okay, to be fair, the truth is that he was reading what his tattoo said. But everyone is free to interpret.