Divorced single mother with twins: a boy and a girl. Things were all well and good until I recently came home and caught them fucking. Each other. They didn't notice me and I, I didn't stop them. I just silently watched. Getting more and more turned on by the second. That night (and almost every night since) I jilled-off a couple times thinking about what I saw. (Long overdue) Update: It took a bit of time, but the urge just became too much. Long story short, started "sleeping" with both of my kids. They are off at college now, but their visits home from school are... amazing! I just miss them so much while they are away.
Have wondered what it was that was the trigger to my kids fucking each other.