As Lacey sticks the bottle into the potion to fill it up, she also puts her entire hand in with it, going almost halfway up her forearm.
When she turns around to bring the bottle back over to Patrick, she starts to change too.
Unlike Patrick though, her chest didn't expand, instead seemingly pulling itself in, her breasts getting smaller and tighter, changing from breasts to simply a pair of well defined pecs.
The rest of her body was changing too. Not necessarily getting more buff, but rather more toned, as well as growing a good amount of hair. Her arms got tougher as the muscles developed, and her previously flat stomach was accentuated by a well defined six pack.
Next up was the ears and tail, though unlike Patrick's lop ears, Lacey's stayed upright.
And finishing off Lacey's changes was her own sex change, as her womanhood was replaced with a fairly impressive penis.
Lacey tapped Patrick on the shoulder, snapping her back to reality and making her embarrasingly aware of her accidental staring.
"I suppose we should have new names while we're like this. Calling a pretty girl like you Patrick would be kinda odd. How about instead of Lacey you call me Luke, and I'll call you... Patty." he says, his voice still somewhat high, but undeniably masculine regardless. "I noticed you noticing my new cock, so how about we make a deal, you drink this second bottle of potion I just got you, and I'll help you try your new womanhood out on this thing."