It wants to cuddle your insides and breed itself upon your organs so her babies can eat your innards so they can GROW UP!
THEN THEY WILL TASTE FLESH AND BECOME MONSTERS OF MASS DESTRUCTION AS THEY TAKE OVER POPULATED TOWNS, THEN MOVE TO CITIES AS THE MULTIPLY.
THEN AN OPERATION HAMMERDOWN HAS TO COMMENCE TO TRY AND HALT THEIR INVASION UPON HUMANKIND BEFORE THEY TAKE OVER THE PLANET.
Then the resulting aftermath, billions of humans will die and it will be all your fault because you didn't kill that spider.