kept secret tonight

i did something i know my spouse wouldnt like or understand last night. went to this underground bdsm event in the city and found a sub who was so into it, her body was shaking with need as she wrapped her legs around me and pulled me closer. had sex on that cold cement floor, she was wet and eager, moaning out loud, begging for more while i thrust deep inside her. felt so naughty but also just right, like we were the only two people in the world.