Mary watched Jeff's escape from her webbing and the reveal of his new form with awe. "I turned you into even more of a spider than me! I wasn't expecting that, but I like it."
Jeff took a few awkward steps to bring him close to Mary. "I like it too."
They kissed, embracing in a way they never had before thanks to their new extra appendages. Their lips parted, but they looked in each others eyes and saw the same animal passion burning there. Jeff's transformation had refreshed him from Mary riding him and Mary was turned on by Jeff's changes. They made out and while both kept their normal arms wrapped around the other, both use their middle arms for other things: fondling Mary's breasts, fingering Mary's vagina, stroking Jeff's engorged penis.
Finally Jeff could wait no longer. He abruptly flipped Mary over on her hands and knees and climbed on top of her. Even as he did, he took notice of Mary's ass which seemed larger. Could it be growning into a spider's abdomen? The though excited Jeff. Then spider Jeff mounted spider Mary and thrust into her. He had to keep the hands that used to be his feet on the ground, but the other six hands were free to fondle Mary's breasts. Jeff felt more changes were in store.