Brock recently moved in with his girlfriend Sienna and they've been getting used to living together. Around their home they assumed different chores to keep the work simple with Brock getting trash, cleaning the bathroom and laundry while Sienna got vacuuming, sweeping and washing the dishes. Over time the chores around the house were becoming more and more simple as they got used to it but someone messing up with bound to happen. One day Sienna was in a hurry to go out with her girls birthday party and need to wash an outfit she had picked out as soon as possible. She quickly put a new detergent Brock had bought for cheap at the store into a cup without looking at the instructions and loaded random clothes in the washing machine from both her and Brock's piles. After some time it was done and she put the clothes in the dryer for a couple minutes because she was going to be late and left with slightly damp clothes. While all this was happening Brock was playing on his PS5 and didn't hear a thing. Once he got off the game he took a short shower and went into the laundry room and noticed that Sienna had washed mix matched piles of clothes with the wrong detergent. He stuck his hand in dryer and felt a shock from the clothes resulting in his body transforming into a female version of itself. Brock freaked out as he now had big breasts and smaller proportions compared to his old body. He then looked down at the detergent Sienna used to wash and realized that on the bottle it said to keep male clothes and female clothes separate or else their would be side effects.