1. Orgasm Denial has long been a tool to stave off depression for me. When I started with my GF it also provided her a sense of power and reassurance that I find her attractive. Over all, the feelings that I had at first when I was inexperienced was a constant feeling of stressed arousal that left me breathing heavy when left alone and distraction-less. As I got more mastery over my thoughts (Due to the thought correcting pain of arousal in a chastity device), it became sort of a relaxed and more innocent state to be in, since I know lewd thoughts will do me no good. So there is a lot more reading and cuddles (with no desire for more) when we are not playing.
2. The first time I ate a girl out was clumsy and virginal, when neither one of us knew what we were doing. I did poorly and she didn't correct me, but she got off. The first time I ate out a girl as a sub, I was at a kinky pirate party, she sat down at a chair, asked me to sit at her feet, and then after talking and drinking for a while, she said in a domineering voice "I want you to eat me out" and meekly I agreed, and sitting there she pulled her dress over my head and had me service her right there, I was semi alarmed by the exposer, and was doing my best because I wanted her to enjoy me, she gave me some instruction, "higher, lower, suck there and don't stop". After she got off and we cleaned up a bit, she showed me off to her friends and I felt meek and unworthy since all I did was use my tongue as instructed, but apparently she saw the potential in my ability and took me home to give her 5 or 6 more orgasms that night though various means.