When Jeff woke up, Emily was standing over his bed.
"Wow, you're finally awake. Ten hours - I bet a lot of moms would love if their babies slept that long. But don't worry, I've turned off the extra sleepiness now."
Jeff was confused and not fully awake yet. He inexplicably wanted to be held, so he was happy when Emily picked him up.
"I bet you need a diaper change after that long time." she said. She was probably right, as the disposable diaper between his legs felt warm and thicker than before. He was placed on the changing table and Emily took off his pants and unbuttoned his onesie. For some reason the fact that his sister was about to see him naked and clean his privates didn't disturb him at all, it felt natural to him and he was happy she took care of him when she opened the diaper and wiped. She gently lifted his butt and replaced the wet diaper with a fresh one, and Jeff wondered where she had learned to change a diaper so well. She quickly closed it and blew a raspberry on his tummy, making him laugh joyfully. Emily fully dressed him and picked him up again
"I have a surprise for you, Jeffy." she whispered into his ear. He wondered what it was, but got an idea when she sat down with him in her lap and pulled up her shirt to reveal her bra - was she going to breastfeed him? Indeed, she freed one of her large breasts from what he saw now was a nursing bra with detachable cups. He had taken a keen interest in his sisters' mammaries for a while and he enjoyed the sight, but the reason now was different from when he was a big boy - he was hungry and thirsty for her milk. "You're hungry, aren't you?" she teased, and if he could talk he would have answered "damn right, I am!". Luckily, she lifted him up to the breast now and he opened his mouth wide to meet the nipple. He closed it around the soft, inexplicably sweet flesh and began to squeeze it with his tongue. A lot of delicious milk came into his mouth, and he gulped it down, surprised as he had thought only mothers had milk in their breasts. "I used the device to make me your biological mother. You like it, don't you? Me too. I also made myself a bit older so I wouldn't be a teen mom. I'm 23 now and you're three months old. I thought we could try this out for a few days while mom and dad are on holiday. If you or I don't like it any more, we can turn back at any time, okay?" Jeff didn't react, he was too busy drinking. For the moment, he certainly liked Emily's - or mommy's - idea. They were both wondering how their experiment would go on.