Half hard and past the knee.

You clutch your dick to your leg only to find that whatever the hell is going on affected you to. As your erection only just reaching half mast can be felt brushing past your kneecap. Your mind is a race with anxiety as your question internally what the hell is going on. You need to think and you need to get away from the two ludicrously sexy bimbos that have replaced your mother and sister. With your free hand you pick up the fork and try and act casual poking at your breakfast, as your new mom and your old dad chatter about something that happened on the news. You can feel yourself getting harder despite your best efforts, even just thinking about these strange women who are your family now is getting you harder. You focus on your breakfast just trying to tune everything else out, the shape of the eggs, the length of the back, and the grease on the plate. Doing anything at all you can do to keep your mind distracted even for a moment, until you feel yourself start to soften. Not missing your window you release your hand from your softening mast, and say "I think I heard my phone I will be right back." As you quickly exit the kitchen and once out of eye sight beeline it upstairs, the last thing you hear from the kitchen is your new mother's voice saying "Do you think he is alright he looked a bit flush?"

You go into your room and shut the door, and without thinking pull your pajama pants down. You are greeted with a new dick one that isn't yours. Flaccid its just past your knees and thick as a coke can. Your balls have changed as well to a degree that could only be described as two baseballs hanging off you. The whole monstrous thing completely hairless and smooth not an imperfection on it. You try and lift it from the base and it feels heavy as hell, and you slide one hand up the length near the head your hand barely able to reach around it. It was so damn big and heavy that holding it with one hand near the tip of the shaft caused it to droop a bit in the middle from its own weight. All you can do is look at it with the same awe that your new family members had given to you, and the world seemed to spin a bit as all the shock of it was whirling around in your head at once.

You didn't even notice your new sister opening the door to your room and stand there watching you inspect your own dick. She stood there breathless and silent transfixed on her brother and his massive cock.