Yes (back to being Sam, again)

As the mist vanishes, you move your hand in front of your face, and you are relieved to see your own hand again. That indicates that you have control over your transformations, and soon a broad smile covers your sister Jessica's, your sister Sally's, your brother Mike's and your mother Megan's face, before deciding on the looks of Mike, your little brother. You know that he has a birthday party in one of the coolest kiddieparks of the country, and you want to go there as him. As you walk down the now much larger stairs, you turn Mike's eyes blood red, and you give him black, leathery wings. You also add horns from his forehead. Coupled with the vampiric teeth you now have that will be enough to scare the hell out of Mike, buying you enough time to curse him. You head up to his room, and as you expected he faints upon seeing you. You curse him to be unable to call anyone or to leave the house, and you leave him there. You undo the demonic add-ons, and Mike Thomas is heading towards his friend's birthday party. However, before you leave, you absorb a copy of Mike's memory's into your mind, so that you can recognize his friends and foes. When you arrive at the party, you