His twin sister's Ann and Becca.

Turning around Matt saw his twin sisters Ann and Becca. They both had a shocked look on their faces and fearing they would scream he said. “Don’t freak out. It’s me Matt.” His voice came out as a rich baritone and sounded nothing like what it used to.

The twin’s looked at each other and smiled impishly. They both nodded acknowledging some nonverbal cue they had given each other and looked back at him with a strange look in their eyes. They started to move closer and Becca said. “We don’t care what you call yourself.”

“As long as we can get some of that.” Ann said pointing at his dick. They both licked their lips seductively as they moved closer.

Matt felt himself blush at what his older sisters had suggested. Shaking his head, he said. “No, you don’t understand. I’m your brother.” He pointed at his face and continued. “Something happened to me at the lab today.”

The girls stopped, looking at his face and soon their eyes widened as they both said. “Holy shit.” They looked back at each other realizing they still wanted to fuck him and shrugged a naughty smile spreading across their faces. Turning back to him they continued to move close and Matt knew he needed to do something quick before his options were gone.