His sister of course

He heard a female voice "Jackie omg , Jackie is everything ok" Jack looked up to see his sister "Kelly it hurts so bad , I don't know what's going on but it hurts, make it stop make it stop, why won't it stop". "Oh poor Jackie I looks like you got your first period, don't worry it's normal for sissy males like you to have one every month". Sobbing he said "I have to be in pain every month, but why I don't understand what's happening to me is there anything I can do to make it better". "Oh Jackie it's only natural, it's part of every sissy males monthly cycle so that he can make baby's, oh and I think I know something that might be able to help" she said whilst seductively removing all her clothes one by one.

Now fully naked She moved over to stand in front of him, still holding her phone in their right hand. Jack is head height slightly below crotch level to her tall frame due to him being on the toilet. "Look Jackie look at my lovely lady area, look how hairy it's gotten on the front so (feminine?) right I feel so mature and I heard they Bois love that, and it smells so good can't you smell it" Jack could smell it , it's scent was almost intoxicating it made his mouth water.

"I learned something now Jackie watch this" Jack watched as the clitoris at the front of his sisters crotch grew hypnotically in both length and size till it was almost as big as his floppy penis only hers was hard and leaking something white and sticky. Jack felt an urge to taste it but did nothing till his sister spoke "look as this Jackie it's almost as big as your penis only my clitoris gets erect and I think it wants to go in your mouth , I bet it would taste really yummy , look it's leaking some nice salty cream out the tip, why don't you give it a suck whilst I make some changes on my phone, I was thinking maybe we could make you remember or maybe we can improve your body some how or maybe we can make the world even more fun, oh what should be do so many choices.

Her crotch was so close to jacks face that when she said suck he instinctively engulfed her clitoral head in his mouth, it tasted amazing, he sucked and licked and felt amazing as his head moved on its own bobbing up and down on the shaft tasting all that salty pregirl nectar. His eyes looked upwards seeing Kelly smile back as she typed something on her phone. Time felt like it slowed and Jack felt amazing in this moment feeling joy seeing his sister smile, he hadn't even noticed that the pain didn't feel bad anymore or that he was still laying these egg things from his penis, his only focus was what was in front of him.

His sister typing on her phone then she looked back at him and pressing a button "mmmm your doing really good Jackie suck it all down I can feel it coming suck it all down and we will be together forever". he felt her clit twitch and expand a bit before he felt a load of the best tasting liquid he ever tasted blast in to his mouth and down his throught, gulping down as much as he could for minuets before his sister pulled it out of his mouth and sprayed a bit of the white sticky liquid over his face covering his eyes before everything went white and something changed.