This set of images was initially drawn as a development of one of the sketches I uploaded in this picture
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A passage from the image description I wrote for that picture would then form the basis of the following images - "Then he coaxes the cub out of their bedroom and after a few reassuring words, uses his powerful feet to carry the little tyke aloft as he takes off into the night, delighting the cub as Reimundo glides swoops high over the rooftops."
So, from the opening image at the top left, then going in a clockwise direction until the final picture in the bottom left, the events played out as follows ~
Image 1: Having encouraged his young charge that it'll be totally safe in his paws, Reimundo uses his foot to grab the cub and helps him up onto the windowsill, the big bat constantly reassuring the rabbit that he'll not drop them - even going so far as to cradle his wing-arm under the dangling boy's feet as Rei swings them out into the open air and the back garden a floor below.
Rei is still his charming self despite his half-naked and transformed appearance, playfully talking to the bunny about all the fun they'll be having soon, even as his bloated sheath and sac wobble and churn behind the cub's head, and the bat's prominent pecs and chiselled muscles drip with noticeable amounts of sweat.
Image 2: Once he's ready and got a secure grip on the rabbit, Reimundo spreads his huge wings and [Image 3] soars out into the night sky.
Image 4 (Bottom middle): Flying effortlessly high above, the Spectral bat gives the delighted bunny orphan a grand view of the cityscape passing far beneath, the youngster pointing out familiar landmarks that glowed with the thousands of street lights illuminating the town centre. With each powerful wing flap however, the bat carrying the boy was getting more and more aroused, and now his cock tip had slid fully out of his sheath and his balls had swollen bigger too, the fabric of his shorts starting to rip and tear around their expanding form.
Image 5 (bottom right): Realising he can't make a direct trip to his mansion, Reimundo decided to make a landing in some parkland, lowering the cub down to the grassy ground first before touching down himself. Once on the ground, the bat experiences another surge of growth, his cock and balls expanding with such force that his shorts exploded off his thighs.
Image 6 (bottom left): The now taller, broader and heavier bat, his now freed ballsac dripping with built up sweat, quickly thumps over to the rabbit kit and starts rubbing those nuts and half-hard cock all over his face and chest, telling the cub that this was just a way for him to get to know them better.
More recently though, I've drawn an updated version of this set of sketches, which I feel are a better representation of the ideas of Rei's character and appearance that I was aiming for initially.
I'll upload those ones soon.