Do you think Mae intended to feed on calib; keeeel him, but miscalculated her time; and had to abort the process to avoid the sun? or do you think she really just wanted a ride, and nipped him, from some sort of autonomic response beyond her control?
shareI would say the latter.
She just couldn't help herself. As we see in both this and many other vampire films (possibly all of them), feeding and sex are closely related. She was attracted to Caleb and wanted to get intimate with him but she couldn't ignore -- at least not completely -- her need to feed.
Her feed-need got the better of her... and him.
Caleb didn’t know he was getting rapey with a blood-bitch, and now he’s fucked!