Experiment : Human - Johnlock Smut

"Okay, that's it!" John's impatience blared out with his words.
"I have dealt with a lot of your 'experiments' Sherlock, but having an actual breathing human bein-"
"Shh!" The dark haired male cuts in, not sparing a glance at his roommate in the doorway.
"By god, he has gone mad," John whispers hysterically. Questions and assumptions flood his mind but he forces himself to ignore them. He wanted to fully enter his home before falling ill. He knew, with Sherlock, he would never get a straight answer. So he'll save his energy for dealing with his odd friend, alone.