Right here´s the story...
My inlaws are coming over for Christmas dinner but i have a problem with the Mother in law. I pumped her about 5 months ago at their house. She is a hot Milf and i made a mistake although i really had a good f-ck and i loved creaming her big titties. i mean what should i do ? i can´t not invite them as they come every year. what if she starts making comments or rubs my cock? I might be tempted to do it again 
Geeze ... 
This story is an absolute pile of fucking horseshit.
You fucked your wife's mother......If this story was even remotely true, that makes you a complete idiot. You plan to stay married to your wife and have this situation hang over your head? And the mother was okay with betraying her own daughter over your cock? What kind of shit-bag looney bin family did you marry into?