It was a blessing and a curse, the day your girlfriend started turning into a pig. Well, explicitly, it was absolutely a curse, and there didn't seem to be a cure for it. Acceptance set in quickly...certain new struggles would set her off, and you'd console her, but that happened less and less as the transformation progressed. She started acting more...rough, debased. You weren't sure if it was part of the curse, or a side effect, that becoming more outwardly piggish led her to stop caring about appearances.
An hour ago when you were picking up groceries with her, she started begging you for sex. First as a whisper, then more loudly squealing about it...you promised her you'd give her anything she wanted once you got home, which placated her for a bit. Then in the checkout line you heard some gasps and murmurs from others around you, and turned to find her grunting and masturbating in front of everyone. You managed to pull her hooflike hand out of her pants and gave her a quick kiss on the snout to get her to stop, paid for your groceries quickly and got the hell out of there.
But as for the blessing? This part's the blessing. That wild look in her eyes, the way she drools over you...you take the bad with the good.