Our Secret

I'm a single mom, nothing very special I guess. I'm 5' 2" and about 105 lbs. 32A with brown eyes and hair. A couple of months ago while my ex had the kids I visited my bff from highschool for the weekend. Long story short, we had way too much to drink and ended up naked in her Jacuzzi. Next thing I know, we are on the par and she's eating me out and I'm loving it. She starts fingering me at the same time. Then 2 fingers in me then 3, 4, and eventually her whole hand. It was incredible I have never came so hard in my life.
The next day after sobering up she confessed that she was gay and always wanted me. I never thought about girls sexually but I loved her and what she did to me last night. She asked if she could do it again and I agreed. Again, it was amazing. She asked if we can get together regularly for this and I don't have to do anything back to her. I couldn't say no. Since then she's done this to me a dozen times or more.
I have kissed her and sucked her nipples but nothing else yet.. I think I should at least lick her back. But she says it's not important. But I feel it's not fair. I'm thinking I still have to.
I never in a hundred years would have thought I'd be doing this or really wanting to lick a pussy, but it's all I can think about lately.
She's promised to keep this our secret. She says she loves me and I'm pretty sure I love her too.
It's very new and strange for me right now. But I'm looking forward to see how it goes especially after struggling with self esteem issues since my ex cheated on me and left me for another woman with big tits.