Deeper Than Bass by tayeah
Makoto is been in a band with his friends, but always asked Haru to refrain from watching them perform. One day Haru decides to see what the big deal is and is shocked (and turned on) by what he sees.
Wow! This story is awesome! tayeah effectively wrote the tension, electricity and heat Makoto projects while performing and the utter disbelief and extreme interest that Haru displays. In other words, this fic is hot, hot, HOT! Definitely give it a try!
artwork credit: j-witless