As soon as we were alone, I locked the door and slowly made my way towards him. He was sitting on the couch, looking a bit flustered and unsure of himself. I walked up behind him and wrapped my arms around his neck, pressing my breasts against his back. He let out a soft moan when he felt my hard nipples against him.
I whispered into his ear, "You've been such a good boy, haven't you, stepbrother?" He didn't respond, but his breathing was getting heavier. I released one of his hands and guided it to my waist, then slowly moved it up towards my chest. As soon as his fingertips touched my bra, I gasped and arched my back, pressing myself even harder against him.
Without another word, I lowered myself onto his lap, straddling him. His erection was already pressing against his jeans as he walked towards her.
