You were just about to pull the trigger when Caleb's ears perked up and his head swiveled around. Clearly, he still had the sensitive hearing of a dog, and he must have noticed the sound of you trying to ambush him as quietly as possible. Seeing him turn back toward you, you panic and try to conceal the gun, pressing it tightly against your side with the barrel pointing upwards.
As you look up at Caleb, you suddenly feel a strange heat that engulfs your entire body. At first, you thought it was just the same sense of attraction that overwhelmed you when you first laid eyes on your new boyfriend, which was bad enough by itself. But it was more than that. Out of the corner of your eye, you spotted a sudden burst of white. Looking down, you find that the change in color came from your own left hand, which now bore a coat of lightly-colored fur!
The changes didn't stop there, either. Your furry fingers were getting thicker, each one gaining a thick black pad at the tip. Your nails were growing into sharp points that poked out above the increasingly thick coat of hair. Your hands now looked quite a bit like the ones you'd seen on Caleb: the paws of a dog, yet with all the dexterity of a human hand. And all the while, the white fur was steadily creeping its way up your arm, taking over more and more of your skin.
You hardly had time to understand what you were seeing before something else distracted you: a big black spot hanging right in front of your face. As the spot slowly pushed outward and away from your field of vision, you suddenly realized that you could feel a dull pressure in your head that felt like it was trying to escape from your nose and your mouth. Your nose was growing, and your lower jaw was coming along for the ride with it, both of them getting further and further from where they were supposed to be.
That wasn't the only place where you could feel a strange pressure, either. It was coming from your chest, too, filling the inside of your T-shirt with a form of flesh you were entirely unfamiliar with. Looking down didn't help: your nose was now blocking the view of whatever was happening to your upper torso. Tilting your head to look over the side of your new snout, you could see cleavage poking out of the neck of your shirt, and the outline of what were clearly some sizable breasts strained against the fabric from underneath.
Your shirt was getting tighter and tighter on you, and just when you thought it was about to rip open, it disappeared, along with the rest of your clothes. In their place, a new outfit appeared: a much skimpier T-shirt, molded to the shape of your new feminine curves, and a skirt below that. Both of them were bright pink. And very revealing. So revealing, in fact, that you could now see for the first time the fur that was covering your entire body from head to toe.
There was no doubt in your mind what did this: it must be the same magic that turned Caleb into your anthropomorphic boyfriend. But you didn't understand why this was happening to you until you happened to catch a glance of your other, tightly clenched paw, the one that was still holding the gun. Your furry finger was pressed firmly against the trigger, exactly where you had put it when you were about to shoot Caleb again. The barrel was poking up into your armpit.
Well, now you've really done it. It occurred to you that the Girlfriend Gun had worked exactly as intended this time, and now you were the girlfriend. Caleb's girlfriend. And probably Caleb's ideal girlfriend, which means he must not be gay anymore. You look up at Caleb, who's been staring at you this entire time. He looks confused, but you quickly realize that you can sense something else. The smell of his attraction, which you would never have noticed before, is overpowering now. So Caleb definitely isn't gay anymore. And while this certainly isn't what you wanted, you at least got part of what you were hoping for: You aren't gay anymore, either.