I was home when my stepdaughter came back from hanging out with her friends. We had a little chat and she kept staring at my pants for some reason. She was acting weird, then said she wanted to take a nap. I was about to order food for when she woke up. I opened the bedroom door and caught her watching trans porn and jerking off. She’s trans too. She said she got horny because she thought I had a boner earlier — and apparently I did without even noticing. We decided to just watch porn together and jerk off like a messed-up little step family. Our dicks got rock hard fast. She started stroking me while she stroked herself. Things escalated and we started fucking while the house was empty. I pounded her hard. She was going crazy, having orgasm after orgasm and even peeing everywhere. I stretched her tight ass open and filled it with a big load of cum.