Ginny slowly nibbled his ear. Harry instinctively tilted his head down as she kissed down his neck towards his unbuttoned shirt. She looked up at Harry as he grabbed her hands and stood both of them up off the bed. Ginny was confused until Harry spun her around, beginning to un-zipper her red dress. She guided his hands to the flap where the zipper was, and he began slowly to pull down. The zipper reached the end of her back, exposing her maroon silk bra and the tip of her matching panties, and she was sliding it off her shoulders as Ron rudely ran into the room.
"Harry, where's my-" but he stopped mid-sentence and changed gears, "What the HELL are you doing with my sister?" Harry was frozen in time as Ron turned red with understanding.
"You're not… You can't be… but you are!!!" he mumbled. Ginny turned red, and zipped up her dress as Ron pulled out his wand. Harry pulled out his too, but Ginny just bat-bogey hexed Ron and ran out of the room.