Question: I was with someone, there was no sex, just the famous nipple sucking with my mouth. I didn t notice any wound on my partner s nipple, and she wasn t breastfeeding either. I was sucking her nipple with my mouth for about 30 seconds, nibbling it a little and pulling it slightly, but not intending to hurt her. As I was finishing sucking her nipples, I felt a slight taste of blood in my mouth, which worried me a lot because I had a canker sore in my mouth. I didn t bite her nipples hard enough to cause any cuts, and I didn t chew her breast forcefully because she didn t scream or complain. I believe if I had pierced her breast, she would have felt stronger pain and complained. After I stopped, her breast wasn t bleeding. In the morning, we went to the hospital, and we both got tested for HIV and other diseases, and the results were all negative. HOWEVER, she told me that 72 hours before, she had sex with another person. I know her negative result was for the past 30 days, not for the unprotected encounter she had 72 hours before me. My question is, could I be infected by sucking her nipples after feeling the slight taste of blood in my mouth, considering that I had a small lesion in my mouth, if she got infected and it hasn t shown up in her test yet? Another question, since she had unprotected sex 72 hours before me, If she had been infected, would the virus amount in her body be large enough to infect me with that slight taste of blood I felt in my mouth, considering I had a canker sore?