um. lockjaw?

so i’ve given countless blowjobs to my ex boyfriend during our relationship. i always gagged a bit, and i got slight discomfort, but this is weird

i haven’t been able to get my new boyfriend off via bj yet. i’ve only really put everything into it twice, but even after quick ones before sex and such, my jaw gets completely stuck for about 5 seconds.

i can’t close my mouth afterwards because my jaw gets stuck, and it doesn’t exactly hurt, but it’s really really scary i guess. then there’s a loud pop and my mouth is normal again.

is there any way to combat this? i feel awful for not having given a successful blowjob yet lol.