Someone who was turned into a beast-like monster by a curse that can only be broken by their true love's kiss, returning them to the form their true love desires most
Finally, after many hardships and difficulties, sickened by how frightening they are, they manage to reunite with their beloved, and they cautiously reassure them that they know they look horrifying but they can fix this, they trust in their love to save them
And so they kiss, but the person who was cursed is confused and horrified when their claws grow even larger, their fangs become more prominent, they're physically even larger than they were, and they wonder what trick this is, what went wrong? They were supposed to turn back, the curse was supposed to be broken... Horns grow larger, fur grows thicker, everything they already grew to fear seeing in a reflection becomes more.
And then they feel a sudden monstrous lust well up inside of them, an obscene, thick, knotted cock with heavy, aching balls growing between their legs, they're embarrassed to find several rows of relatively small but notable teats along their torso, and drool starts to pour from their open maw, tongue distended as their nose picks up on the incredible scent coming from their beloved's own lust...
The curse was broken, they realise, but the form they had before apparently wasn't nearly as enticing for their beloved as this one. And there's a sense of betrayal there, though it's quickly overtaken by the carnal hunger welling inside them, and they figure-- well, they've been separated for so long, and this is the form their beloved apparently wanted more than anything, so they suppose it's only right to use it...
It's a wonder how easily their new claws shred fabric, how large their paw-like hands are and how perfectly they can encircle their beloved's waist, and how little strength they need to use to hold them so they can finally sheathe their massive cock inside them, bouncing them up and down as they sharply rut into them. Losing themselves into the sensations of it, and their beloved's cries sounding like the sweetest music as they force their fat knot inside them before yanking it out and then hammering it inside again. That obscene, delicious pop each time it's pulled back out will live in their memory forever, they think.
They definitely realise there are depths to their beloved's depravity and perversion in turning them into this creature when they realise just how much cum they're able to fit into their beloved, and how little time they apparently need to recover before filling them with another load.
Once they're finally sated, they almost feel bad for how they've acted, before they look down and see their beloved snuggled against them, covered in cum and their holes absolutely ruined, cum still smeared down their chin and chest from where they used their beloved's now-swollen and tender mouth, lapping at one of the teats down their torso, looking at them with more love than ever, and holding one of their paws against their chest.
Well... there's at least one constant still guiding them, and it should be easier than ever to protect themselves and their beloved as they explore this new chapter of their lives...