Honjitsu, Hatsujouki.: Omae no Karada, Zenbu Umai

Yura is given experimental allergy medicine from his coworker Hiramatsu for his allergies. He ends up suffering from the side effect of releasing strong pheromones! He even suffers from the rare side effect... going into heat. With it being unclear when the side effects will go away, Hiramatsu starts living with him to help deal with them.

(Source: WWWave Corporation)