I had a good relationship with my sister-in-law and we kept in touch frequently. But one day, she complained to me that she wasn't satisfied with her husband (my brother) lately, and then asked if we could meet on a day when he was out of town on business. Since I needed to release some pent-up sexual energy, I also invited my friend, and we had a sex party with my sister-in-law at a hotel. Although I felt guilty towards my brother, it was for his wife (laughs), so I let her have her fill, over and over again, aiming to break her record for the most orgasms in a single day, and gave it to her raw.
