My vag burns after masturbating

I don't usually masturbate a lot but yesterday I took a hair brush, covered it in plastic and used it on me. (I didn't use the bristle end of course). I used pure coconut oil as lube. I don't know why it burns. Any explanations/ideas to make the burn less? 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors