Thanks for all these additional details.
I can understand your concern and worry.
Well, as there was no anal sex, so you are pretty safe.
As such you would not get any STD by this way. No need to get panic.
You are completely safe.
I would make clear that Only by Mutual masturbation/ fingering one would not transfer any such infections.
Please don't worry at all,
As such, there has not been a single documented case of getting STD by masturbation or by fingering.
You are very much safe.
Hope this helped
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