Thank you for your inquiry. From what we gather from the question, you were asking about the risk of acquiring HIV after engaging in protected anal sex with subsequent anal fingering using semen as lubricant. From the information given, this scenario is determined to be Low Risk (evidence of transmission occurs through these activities when certain conditions are met).
The scenario mentioned above could meet the three components of the transmission equation. Note that the highest risk activity in the situation described is the protected anal sex, due to improper use or potential breakage of the condom. There is a theoretical possibility that the use of semen as a lubricant for fingering could allow for transmission of HIV, but exposure to oxygen would very quickly render the HIV virus inactive (1).
If you are continuously engaging in high risk activity there are biomedical approaches such as PrEP and PEP that help lower your risk of acquiring HIV. Refer to your physicians for further information.
Recommendation: Refer to a health care provider for HIV testing.
AIDS Vancouver Helpline/Online, Marie
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1) Survival of HIV in the Environment