Sucking Big Dick

Now, this may has been discussed A LOT on here. So sorry if I am beating a dead horse.

Within the past month-ish, my boyfriend (23) and I (22F) started being sexually active. Yay! One obstacle I’m having is his big dick. Nothing wrong with it, I LOVE it. I just don’t know how to suck a big dick.

Prior to my current boyfriend, I’ve only sucked dick like twice(?). It was with my abusive ex. I hated it, he hated it. End of story. I never wanted to suck dick again. I found it disgusting and got no pleasure from it.

But with my current boyfriend, I am super eager to. I’m simply struggling with HOW. It’s long (7in maybe…?) and girthy. I have a very sensitive gag reflex and I’m surprised I can even fit it in my mouth (my mouth is relative but so…). I just want to be sure I am doing something he will enjoy and I will enjoy! He says I’m great with handjobs which is a good start, but I wanna go beyond that.

I will take any advice. Thank you in advance!