OFKU-080 Behind Her Husband's Back, I Was Fucking The Bride's Mother... Mirei Kyono (44)

My wife and a friend left for a hot spring trip for 3 days and 2 nights. Her wife's mother is 44 years old and in the prime of her life. She is youthful, charming and feminine. Her mother-in-law has a slim figure, but she has a moderate amount of flesh, and I have always felt sexual desire. Her wife's family treats me like a real son. However, I have a bad feeling towards her mother-in-law, and I want to make her feel like that somehow.