His sons girlfriend

as David was trying to decide who to turn himself into when Jacob said he was going out to pickup something for his girlfriend who will be here shortly and let her know I will be right back. David Says sure thing son He then goes and gets his device to decide who to become as he grabs the device the door bell rings so he goes to answer it and as he looks out he sees his sons girlfriend Nancy so he takes the opportunity to scan her before he answers the door and decided who he was going to turn into since she was dressed nice for her date that evening as he lets her in he tells her Jacob will be back shortly and to make her self comfortable. As she sits down he secretly pulls out his device and amis it ar her and activating it leaving her looking like this.

He then picks her up and places her on the book shelf then he says lets test how far this device can go and aims it at him self and selecting her image and turns into her and he set it for full transformation which would make him her full genitic double down to D N A , voice and skills he also has full functionality of a woman ( IE have sex, get pregnant, or give birth) but still rembers who he really is. He then notices the battery on the device is dead leaving him trapped as her instead of changing back as he planned till he can re charge the device .

leaving him looking this (model Nancy A)