You lay there on the ground defeated by the giant spider, but instead of eating you, it had a better idea, considering that you both were evenly matched. Just then, its mouth tentacles lunge at you, shoving one in your butt, one in your pussy, while four wrap around your limbs, and continue to destroy your knights uniform.
As your chest armor comes off, along with your gloves, the tentacles pull you closer to the giant spider, as its mouth gets bigger, and your feet go inside, along with the rest of your legs. Unfortunately, by the time the spider reached your waist, you've become completely naked, and the tentacles around your limbs start to let go of you, while the tentacle in your pussy does the same thing. Then while the tentacles, go back into the spider's mouth, it's eyes, and teeth disappear, and white fur grows around you.
The iris's, and pupils vanish in your eyes, as you pass out, but then wake up only to find that you could now control the spiders legs, and butt as you were now able to shoot webs. The giant spider that you battled fused with you, and you've become a spider taur.