About an hour ago, I ate my girlfriend out. Both of us were (are) still virgins and neither of us had been in a previous sexual relationship. Almost immediately after going down on her, the inside of my upper lip began to burn and sting. Now, it has progressed to my throat. I m just concerned about any possible STDs, infections, etc. A side note: she had recently taken a shower and smelled a bit... sour? Or maybe, like, sharp, yet musky at the same time.