Roleplaying a steamy affair with my voluptuous stepmom on her special day

Celebrating my stepmom's special day, I decided to treat her to a steamy rendezvous, ignoring the age gap. As a loving stepson, I've always been captivated by her voluptuous figure and allure. In a teasing POV, I teased her ample bosom, igniting a passionate encounter. She's not just my stepmom, but a sultry MILF with a tantalizing big ass that's irresistible. Our roleplay transformed into a passionate affair, with her riding me like a pro, her experienced hands and lips working their magic. The birthday girl proved her sexual prowess, taking charge and leaving me in awe. This isn't a regular son and stepmom scenario, but a sensual exploration of forbidden pleasure.