While I love Literotica, my favorite dirty stories of all time are sometimes somewhere else:
Mother's Little Helper by Rachel Ross
Denial by Deirdre
A Kind Offer by Orestes
One great author here is Lauries Husband!
One particular genre that I really enjoy involves formerly-straight men who have a gay/bi encounter that is humiliating to them because it is witnessed by others. "Sucking at the Picnic" by Bullfrogts, for example, and "It's OK" by Cyanlot are examples. My favorites list here is full of them.
Location
Kneeling at your feetGender
Male