Before she could make up her mind she hard the sound of keys scratching at the door. Eventually they found their target and turned the lock, the door peering open. Gemma just stared and watched as her younger brother James strolled in walking right past the lounge straight to the kitchen. Ignoring the scene that lay before him. She stood there motionless while listening intently. She heard the fridge open as her brother grabbed himself a drink, then she heard the sound of glass breaking as he dropped his cup and ran straight to the living room.
"WHAT THE HELL IS GOING ON!!??" He yelled. "Why is there cum everywhere!? Whose clothes are they!? Why is there a Donkey in the living room and what the hell are you supposed to be!? Are you still my sister?! You have a penis! WHAT THE HELL HAPPENED HERE?!" He stood there, now out of breath from yelling. Gemma just stood, not sure whether this was a blessing or a curse. Deciding to play her cards carefully she answered while feigning tears. "Yes it's me! Someone cursed me!" She said in between sobs. She motioned towards her transformed body "I'm slowly turning into this! Please! You've help me!" She ran into his arms and hugged him. The confused brother didn't know what to do. So he just returned the hug.
With question still unanswered he replied "Yes, alright I'll help you! How though!? And I still have a few more questions!". Gemma looked up into his eye's "You mean it? You'll really help me? You'll do anything?" "Yes, of course I will" He replied. A wicked smile took over Gemma's face. "Perfect" She said. Pushing him to the ground forcefully, Gemma pinned his arms down, positioning herself over his body. her increased mass helping to hold him down, although she was lucky that James had always been rather scrawny.
"Gemma! What are you doing?" He said confused. "Getting your 'help' what does it look like? You can start with this!" James felt something pushing against his face, tilting his head down he saw an erect donkey penis begging for attention. He opened his mouth to object, when Gemma suddenly thrust it inside muffling his speech, all that came out was "Mmmmph!". Gemma began to rock her hips back and forth, face fucking her brother. "Oh thank you James! I was looking for a new plaything! And you fit the description perfectly! You have Amber to thank for my condition too, thats her over there by the way" She said motioning towards the donkey. This caused James to panic further, he thrashed around, but it was to no avail. "Oooh I love it when you fight, it's only going to get me off faster!" She cooed. "Speaking of which. I hope you're ready! Because here... I... Cuuuuuuummmm! Heee Haaawww!" She brayed loudly as she shot her load into James' mouth. There was so much of it he had two choices, swallow or choke. He chose to swallow. Oddly enough he found that it tasted quite good, and after a while was willingly swallowing it, licking his lips as Gemma's penis retracted back into it's sheath.
Gemma slid down her little brother grinding against him as she did. Eventually she hit a large bump. Looking up at James' who was to preoccupied collecting all of her cum she decided to reward him. She unzipped his pants and pulled out his raging boner, 8 inches in length. "Mhmm little bro, who knew you were so well hung, hope you don't mind if I help myself." She opened her mouth and began to lick up and down the shaft, eventually taking the full 8 inches in her mouth. Loud moans were coming from James as he received his first blow job. He could feel the pressure building until suddenly he came. "Oh god Gemma!" He cried as semen flew from his dick at great speed catching Gemma off guard. Her face and breasts were covered with the sticky substance.
Gemma cleaned herself off and both sibling's rose to their feet. Gemma looked over James' cataloging the changes that were sweeping his body. Interestingly enough, it appeared the same for everyone, hitting the face and genitals first, then a tail and fur, then working it's way up one's body from feet to arms, until finally your body is unable to support itself on two feet. Finally the fur grows in completely, the body mass increases to that of a donkey and the final remnants of the human face are pushed out, making way for that of a donkey. James' was still at an early stage of his transformation, having sprouted a tail and ears, with his penis in the process of changing. Gemma could not see any noticeable changes of her own though.
Looking into each other's eyes the sibling's embraced each other, kissing and caressing each other's bodies while both sporting raging erections. Finally James breaks off from Gemma, asking his older sister "What now?".