Thinking of letting brother lick me 2

I am not sure how to update as I am still fairly new to reddit but so many of you guys asked for an update that I felt like I should post again.

After I posted and all of you guys encouraged me...I kept having such intense thoughts about it. I liked the idea of keeping clothes on because then maybe I wouldn't have to admit to how nasty this has gotten. I am making out with my brother, for gosh sakes! I mean, I am enjoying it but its so messed up. To top it all off, I have a wonderful girlfriend who i love. And she thinks I'm a lesbian. So I am also feeling shame around that aspect as well.

However, last night, my brother came over to hang out and watch TV and of course we ended up making out with an episode of Walking Dead in the background. I had worn a casual skirt and he was excited and kissed all over my legs and started licking my panties. I told him he shouldn't but he kept on. I got soaked through and he kept teasing the edge of the fabric. I was moaning and more turned on than ever and finally I said he could move the fabric but to not take them off. He hardly skipped a beat. He pulled my panties to the side and started licking my pussy. He was so tender and cautious at first that I suddenly had a sinking feeling. I asked if he had ever licked a pussy before. He bashfully admitted he hadn't. And i was so stunned I didnt know what to say and pretty soon his tongue was back on me again. I kept feeling waves of shame followed by intense waves of pleasure as he licked. I eventually got so guilty, I told him to stop before I could cum. He seemed pleased and said he couldn't wait til next time but I am so worried how it might escalate now.