You thought the piercing's name was a joke when you got them, 'monkey rings'. You played along, thinking they were just normal nipple rings, not realizing that the shop you had gone to was in any way special. You'd been wanting them for a while as way to emphasize your nipples, get them to show under your shirts, maybe be a little bit more sensitive. As they recovered, however, you learned they served a different purpose.
You watched over the course of the month as hair spread out around them on your chest, covering your pecs in a dense brush. Your nipples were definitely more sensitive, but the prick of hair under your shirts became distracting. You had never been hairy before, but now it seemed to be growing like wildfire. It didn't take long until you could run your fingers through it, the carpet making it up to your shoulders and having taken over your entire stomach.
Your bush had gone wild. You struggled to keep the fur from showing over your pants, the thick curls surrounding your package. You couldn't see any skin underneath, and trying to clean it after jacking off was impossible. It stank constantly of cum. Your new hair held heat to your body too, trapping your sweat in the dense curls. It wasn't long before the rest of your fur developed a similar musk, locking in the smell of sex.
Breathing it in all day didn't help. You constantly had a semi, a permanent wet spot on the front of your shorts from constant leakage. You could hardly think anymore, subject to your own body's stimulation and smell, your mind suspended in a state of dumb arousal.
You barely recognized yourself in the mirror anymore. Dark fur had conquered your body, having helped you grow a beard, but that was nothing compared to the smell you were constantly wrapped in. You couldn't think the same was a you used to, unable to focus on your thoughts for more than a minute, constantly forgetting things. Empty eyes gazed back from your reflection as you felt heat start to build in your system, your mind emptying out as horny instinct took over. You needed to fuck, and that was all you cared about anymore.