20F here, ive known ive been into beast/zoo since i was really little, growing up i had experiences with family dogs, though never penetration. i stopped all that until recently, my male neutered dog has show interest in licking me, i let him for about an hour today and he loved it. i begin to rub him n could feel him get hard n knot. i was stroking behind the knot and he began gagging a lot, as soon as i stopped he stopped gagging but tried humping my hand so i began again and he started gagging again. it was very odd, he didn’t puke or anything but i think he leaked something onto my hand because there was this slimy clear stuff, only a little bit. i didn’t finish because i didn’t want him to keep gagging and he immediately began to lick me again, after w couple minutes he jumped up and began humping my hand again. next time do i keep going when he’s gagging? does anyone know why he was gagging? he didn’t do it the whole time i stroked him just right before and after the clear stuff leaked. i know he couldn’t have came because he’s neutered. i want him to mount me in the future so any tips or advice is much appreciated!!