How can I ask my gf if she enjoys my oral sex?

We are a lesbian couple going on now for about 7 months, she's very self conscious of her body to the point where I have only seen her boobs🙈. I have given her oral sex about 3 times in the time we have been together and it seemed like she did, but in the beginning of me starting she kinda stops me. I just tried pleasing her because I'm on my cycle and she didn't let me with the excuse of "I gotta get in the shower ". How can I approach the situation?! Any suggestions  

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