First-time experience with a reserved stepsister who is a novice, requesting me to make love to her and climax on her derriere

After a year of longing, my shy and inexperienced stepsister finally mustered the courage to ask me to make love to her. Despite her timidity, she was eager to explore this new experience. As I undressed her, her perky, firm breasts were revealed, igniting a spark of desire within me. I couldn't resist the allure of her voluptuous derriere, and I began to caress it with fervor.I slowly penetrated her tight backdoor, eliciting moans of pleasure from her. I continued to thrust deeper, exploring her unexplored depths. Her body writhed in ecstasy as I reached her sweet spot, causing her to climax and squirt profusely.As I reached my climax, I released my warm seed onto her enticing derriere, marking her first sexual encounter. The sight of her glistening backside, adorned with my essence, was a sight to behold. This was a moment of intense passion, a testament to the beauty of first-time lovemaking.