Solely coz she followed him to OP. Basically, I think Nat showed more trust towards Bart. Not only did he allow him to enter his body, but summoned him again & again inspite of Bart's warnings. A funny, definately odd way to show trust & acc. to Nat it would'nt be 'trust', but there it is ;) .
"If the bee disappears from the surface of the earth, man would have no more than four years to live. No more bees, no more pollination ... no more men!" - Einstein
"I like quoting Einstein. Know why? Because nobody dares contradict you." - Studs Terkel.
<@Ximenez> Sentynel: But i have a life? No. Qed.