Oral tips

I like when my boyfriend cum. Definitely from getting head. I just feel like i accomplished something. Normally when i give head, i suck or play w/ their balls or try to get to their g spot under the balls but my boyfriend don’t like his balls being touch. He say it feels weird. How can i make him nut faster. He say I’m great at giving head but sometimes it be forever before he nutt. I like learning new tricks and maybe to get him to cum faster