Yes
why
I think it can just randomly happen. There were guys in the first Drugless sex who were salary men or deli workers who just got diagnosed.
The important thing was that Tatsumi reacted so strongly to Inui’s smell even when he was on his medicine which meant that Tatsumi truly loved Inui. If someone doesn’t love that person, they won’t react to them if they are on the suppressant medication. For example, those girls in the high school with them. Once Tatsumi took his medicine they did not desire him but Inui still did.
Some one please explain the last chapter.. Did Inui get the pheromone syndrome too or something? why tatsumi started smelling sweetness from him as well?