Looking for story - mother lets sons friends

Hiyall I tried searching for this one through the database and through google but my eyes are falling out and my balls are turning blue after a week of trying to find it..

It was a story about a guys two friends coming over and fucking his mom, high school or college age guys, don't remember now. It was a multipart (I think) but the main thing was that the guys sorta cuckolded him (the son) and his Mom wouldn't screw him, but made him watch as he she took on even more guys later in the story.
At first it kinda turned me off, but now that I can't get it out of my head I can't find the story...

ANY HELP would be greatly apppreciated, and I apologize for asking for help in my first post =)