I'm a 39 year old married man, but also bi-sexual.
Every Saturday my wife takes my daughter out for the day, from 11 in the morning until 8 at night.
This is me time, and usually I by some illicit drugs (cocaine) to see me through. One Saturday I had gone out and bought my drugs and settled for the day as usual, mid afternoon was quickly upon me, so i ruses a bit, it was here it started to go wrong!
My stepson (17) caught me taking the drugs, I was mortified, and attempted to make up excuses, he on the other hand knocked them all back, until I said i would do anything if he didn't tell his mum.
I was shocked when he started undoing his shorts and pointed to his cock. I knew what he meant, so as to not rock the boat I reluctantly, yet excitedly took his swollen dick in my mouth until he splurged in my mouth. This has continued for a couple of weeks, until one Saturday he waited for my wife to leave, grabbed my waist and bent me over the sofa, slamming my boi pussy hard until climax.
It has continued for the past 6 months, but I'm racked with guilt, only with anticipation & excitement for the next week.