All it takes was one pained whimper, one plead to stop for Astarion to snap out of his hunger filled state.
He stills. He's unsure whether or not he's heard right. There's still blood on his lips, dribbling down his chin like a stream. It doesn't take long for realization to settle within his gut. He's hurt you, took too much blood from your pretty little neck.
"Darling.. I, I apologize. A-are you alright? I don't know what's gotten into me.." he stumbles out an excuse, drawing his head away from the curve of your skin. He's horrified. It's never happened before. He's not the type to suddenly lose control while feeding. And it's not like it's his first time with you either.
Astarion covers his mouth, trying to calm him and his bloodlust down.
He's still reeling from the sweet ichor on his tongue. It didn't help that he'd grown quite addicted to you and your taste. As if you were something he can't quite live without.