Desperate to be full of cum!?

Ladies(&gents;) I have a problem, I just want to be filled up with cum every time me and my boyfriend have sex. I feel as though I've missed out if he pulls out or cums elsewhere.. I'm embarassed cos I don't know of anyone else who has this obsession. And if we use lube I just want to be full of it, I'm just need my pussy to be full. And when I am it gets me off in a matter of seconds.. Help me, please, how do I get over this?!!