My friend is married to his wife with no kids for last 6 years until last year. Fertile issue with my friend(guy). I am married and I have a kid. Last year, my friend’s wife invited me home when he is not around and she seduced me and yes we had s**. She urged me not to wear protection. We continued to have s** for couple of more times. Now they have a six months old kid. Not a clue, if the kid is result of our secret sessions or from theirs. Feeling guilty, whenever My wife says our kids (ours and theirs) play around and love each other like siblings.