I blew him for 45 minutes...

Needless to say my jaw hurts. I’m starting to wonder if my man can ever cum from just me going down on him...Normally when I give him a blowjob I go at it until he pulls me up for sex but the other day I just wanted to make him cum. I kept going for 45 minutes and nothing.

With previous partners it took only a few minutes. Any advice?