I would say there is a good possibly it is an oral herpes outbreak because of what you said but you're not going to get symptoms that fast from oral sex just hours before. Definitely need to get tested with the IGG Herpes Select test ASAP and if positive, it probably means you have had HSV orally for a while but now the second problem. If indeed you have had HSV for a while, you now have put this girl at risk of catching it since you were experiencing an outbreak!! Has she seen or felt any symptoms as of yet? All speculation here but looking at it at all angles here. :)
have you talked to your partner about this? Have they been tested to know their own hsv status?
grace