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You're my step-son and I'm so tired of you running all over the house making messes. So I swallow you whole. Once you're in my belly, I'm so happy with how big it is and how powerful I feel. Then, I start feeling some rhythmic movement, are you jerking off in my belly?! Stop that!!! But you continue, and I finally realize I kind of like it. So I tell you to keep going, until you cum, filling my belly even fuller and making me so satisfied. Lots of belly movement from the front and my POV.