Sorry for late reply and inconvenience.
Thanks for all this additional information.
I understand your concern.
I reviewed your picture.
Well as you describe, the chances of STD are less likely.
It sounds like irritant/ friction-induced dermatitis due to rough oral sex and masturbation.
Now I would recommend some self-care measures like
Do cool water sitz bath with betadine solution twice a day for 5-10 minutes.
Clean the area with DIAL soap.
And afterward, apply OTC 1% hydrocortisone cream mixed with 1% Clotrimazole ointment twice a day.
And keep the area dry and clean.
Wear loose-fitting cotton clothes to prevent friction.
Take OTC Motrin and Claritin for a few days.
If you would develop open painful sores with penile discharge then STD panel should be done for a precautionary measure.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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