Your breast pain certainly isn't an STD. Few STDs are carried orally. When present orally, STIs have never been known to be transmitted to body sites other than a partner's genitals, and certainly not known to cause nipple or breast infections. And no infection can start to cause symptoms immediately after exposure or within 24 hours, i.e. the next day. Trauma during the oral contact is the only logical explanation. It certainly isn't STD either.

The only potential STD-like possibility could be herpes, if your partner has oral herpes and had a cold sore outbreak at the time of exposure. In this circumstances, it could be considered sexually related but not really an STD. However, my comments about onset of pain also apply here:  herpes infections cannot cause symptoms sooner than 2-3 days after exposure. Hence my confidence this must have been caused physically.

If the pain is severe or persists more than 2-3 days, of if you develop blisters, sores, redness or swelling of the nipple area, or if there is discharge (pus) from the nipple, see a doctor; these signs could indicate a non-STD infection. Most likely these won't happen and the pain will simply fade away, but check with a doctor if it persists. There is no need to be tested for HIV or any other STD.

I hope these comments are helpful and reassuring. Let me know if anything isn't clear.

HHH, MD