Becka is looking forward to a holiday in the sun with her husband Greg and his family. There is just one problem - Melissa - her future sister-in-law will be there with her two annoying kids. Melissa makes Becka feel inadequate and the atmosphere between the two quickly leads to all kinds of trouble! Melissa is lazy and expects to be waited on while Becka does all the cooking, cleaning, shopping and laundry. Harassed Becka plans revenge, and sabotages Melissa's fat-free diet and ruins all her washing - but her schemes backfire when Greg finds out and treats her to several sessions over his lap. It seems that Greg's brother Grant has inherited the spanking gene, and he gives the outraged Melissa her first ever spanking. Melissa is confused by her mixed feelings but soon learns that a hot bottom leads to hot sex! Much to the surprise of the men, Melissa and Becka become friends and their exploits lead to further fun spankings.