Your sister possesses you

Before you can think of what to do next, your sister quickly runs into you and knocks you over, then climbs on top of you. "Sorry bro, but I can't have you messing with any of my plans," she says, then she slowly starts sinking into your body. You try to reverse the process using your new amulet, but to no avail. Soon, the deed is done, and you can no longer do anything unless your sister does it for you. Your head looks down and notices the lamb, still there. "Hmm... it seems I can stay in this body and still use every single one of my powers, which is a big help," you hear yourself say, "but a 18-year-old is not my idea of a good host." She rubs your hands together. "Time to make some changes..."