This isn't actually "extremely risky behavior".
Oral sex is lower risk than vaginal or anal sex, and you used a condom. The chances of you getting anything from this are very low.
The only real possibilities are genital herpes type 1, if you don't already have oral herpes type 1, and syphilis.
To get syphilis, she'd have to have a sore on her lips where they touched your skin.
HPV is possible, but not likely. It's not typically on the lips as it is in the mouth.
Kissing her quickly on the mouth isn't going to transmit anything if she doesn't have a sore.
I wouldn't worry at all about this.