Me and My Dad's girlfriend
I'm 18 and live with my dad, my sister and since my mum left when i was 14, my dad's girlfriend.
ever since she moved in i have fantasized about me and her.
I masturbated countless times about her and even started to raid her underwear draw when everyone was out.
The other day was one such occasion as my dad and sister were away for the week, so I had been raiding her underwear when I heard the door opening, I scrambled all the underwear back but i still had an erection from the excitement.
When I came downstairs she noticed the erection and started to turn me on even more, we ended up having sex and it was fantastic, she even let me cum on her tits.
Well that week we spent every waking moment having amazing sex everywhere in the house.
Since then we end up having sex whenever were alone and send sexy texts to eachother all the time we even meet up for secret sex sessions.
I don't know what to do know though because I don't want my dad to know I've betrayed him, but the sex is too great for me to say no to.
What should I do?