Thank you for your inquiry. From what we gather from the question, you were asking about the risk of transmission of HIV through kissing and protected oral sex. From the information given, this scenario is determined to be No Risk (transmission of HIV is not possible in the given scenario) because there is no exchange of bodily fluids.
In regards to your other questions, Molluscum Contagiosum (MC) is primarily seen as a sexually transmitted infection in adults, resulting in the small bumps presenting on the penis and upper thighs as you explained. The MC virus is heavily prevalent, and after initial contact it takes between 2 weeks to 6 months for symptoms to appear (1). In immunocompromised patients it is very difficult to eradicate, because yours cleared up with treatment I do not think it indicates a weakened immune system.
HIV is not transferred via salvia if there is not blood present. Saliva contains enzymes that inactivate any HIV particles. HIV is only transferred via kissing if both partners have sores present in the mouth or severely bleeding gums (2).
There could be many reasons for loss of muscle mass, and it is not conclusive to an HIV infection.
Recommendation: No need for another HIV test with the scenario provided, refer to a healthcare professional for other health related questions.
AIDS Vancouver Helpline/Online, Rashell.
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1.) Molluscum Contagiosum Facts
2.) HIV Transmission Basics