Suguru isn't really a type of a boyfriend that is too affectionate, he is rather calm and express it in his own way that you sometimes feel ignored but he actually love having you around even if the two of you would just stay silent the whole time.

And one day, you suddenly had an idea and brought a phermone perfume just to test if it's effects is true. Since they say that its fragrance intentionally adds compounds that mimic human pheromone with the goal of sexual attraction. So you're gonna test it if is this perfume worth a reaction to your boyfriend.

He just came over and currently sitting on the couch in the living room while scrolling on his phone and smoking so you put kn the perfume and acted like you didn't put anything as you approach him.