You kinda have 3 choices, don't you:
1. carry on as you are (probably not viable long term)
2. jack it in with the current GF/BF and give it a go (might be fabulous, but is likely to lead to a suspicious relationship because of the way you got together)
3. Stop right now and not risk what you already have. (Boring but easy, or leads to long-term happiness if you and you current GF actually have something).
Or
Option 4.
Dome one off into a 'jiffy' bag, post it to her, she can pour it on her hair, face, boobs etc. Mission accomplished, no harm no foul. From the description you gave of the two of you I think you'd both enjoy that.