A 221b, inspired by the three words gifted from an anonymous source (masochism, crop and high). Ok, I cheated. I'm pretty sure this is nowhere near what you imagined I would end up with from that prompt!
DISCLAIMER: I own nothing except my own slightly twisted imagination. I didn't steal, I only borrowed.
He does not make a habit of examining his feelings. In fact, the majority of the time he prefers to put them aside altogether and replace them with logic. Logic is simple, predictable, sensible and understandable. Above all things, he likes to understand.
On the rare occasion he finds himself with nothing to do or think on, he'll let himself dip into that well-locked bank of emotion. The experience is uncomfortable at best; at worst it can be rather distressing. Sometimes it can be a delicate form of masochism, dwelling for moments on feelings and the effects they can have on him.
There are benefits to some emotions, the release of adrenaline can enhance the senses and reflexes of the body, or the hit of endorphins can bring a high that rivals the absorption of opiates into the system. But these can lead to distraction, unreliability of reactions, clouding of the mind. Which is, of course, unsatisfactory.
He has spent years teaching himself to sit on these unfortunate byproducts of the human body. They rarely crop up without him inviting them. But now, in a matter of days, his work is undone. And here he sits, examining and feeling. John Watson has blown into his life, bringing with him a whirlwind of feelings and, if he's honest, they're not all bad.
R&R if you please...