Unrelated by blood, a stepmother and her son develop a sexual desire for their nominal relative and begin a relationship. The sexually active stepmother does not care about her husband's weak and rough penis, but instead uses her young son's strong and hard penis as a "tool" to release her own sexual desires. When she feels her body heat up, she immediately starts sucking on her son's penis, thrusting it deep into his vagina and gyrating her hips vigorously to achieve ejaculation.