If you get her pregnant there is always the possibility you could get tapped for baby support. Right now everyone is happy and having a good time. If down the line their relationship goes south and she gets divorced it could get ugly. If SHE feels nasty and vindictive she can tell the judge that her husband ****** her to let some nasty black man get her pregnant. If HE happens to feel nasty and vindictive the kid isn't his, she let some nasty black man fuck her and she got pregnant. Either way you loose. When you start talking about creating another life you better damn well get it down on paper, signed and notarized, every aspect of the agreement. If at a later date she claims she was ******* and was fucked against her will (*******) at least one juror will likely sprain an ankle running to the jury room to convict you. I would walk away unless I had something substantial in writing.
For the record I hardly ever wear a condom, I had a vasectomy a lot of years ago. All my fucking takes place in a mostly closed group that consists of nearly all mature adults. We all keep out sexual activity within our group and with our spouses for those that are married. Everyone gets checked at least a couple of times a year