Sore throat after oral sex?

Lucy

So every time I give oral sex to my boyfriend I end up with a sore throat that lasts a couple days. It’s obnoxious and I end up going long periods of time with out giving it just to have the cycle repeat. Is this something that’s normal? Do I just need to build a tolerance up to it? I did read that flavored lube could help but I’m not sure. Any thoughts?