you (23y/o male) live alone with just your 24y/o stepsister Carissa, she’s a petite fit gym girl, but she’s always been insecure about her chest size

you’re just hanging out on the couch watching tv when Carissa gets home. She hasn’t been home in a few days and had just disappeared without telling you where she was going. You immediately notice something is very different about her, her chest has easily tripled in size