Ruining the reputation

Jenna has always mistreated her little bro Brian. So one day he had his revenge. When she's was prepare herself for a first date with a guy, he used a magic powder and take her place in front of the mirror with much shock of the real Jenna. His plan was to ruin his sis reputation so he was gone to the date dressed like a slut and having sex the first night but something gone wrong. The following morning he found out to be pregnant and that makes the swap permanent.