The chances that you'd get an STI from 10 seconds of oral sex is very, very, very low. I wouldn't even worry about it.
I don't know what the spot was, but if you could scrape it off, it probably wasn't anything more than dry skin. The remaining red spot is probably just irritated skin.
The urine stream - that could be a prostate issue, but that would be separate from your 10 second oral sex.
If it continues, see your doctor.