@lindelof She is sexually arousing you. It is natural for you to ejaculate. That's the way the male body is wired. I'm not sure what your question is, but if it's how to contain the mess, you might try applying a condom after you are erect.
@genji13 If you ae asking about the red area that is almost in the center of the photo, the redness concerns me. It seems to be inflamed and, if so, it is not a mole, When and how did you first notice this?