Me presento... Una sissy en plena transición..

Hello to all, I'm a sissy, my name is Nao, I'm slowly accepting myself, but I want to tell you how I got into this luxurious world... I was a normal boy, 1.70 meters tall, a bit chubby and dark-haired, I had a very beautiful girlfriend with a big booty, we understood each other very well in bed, we would get together every time we had the opportunity, there were afternoons when we would only say hello and spend the whole day having sex until it got dark, I always had a certain fantasy of dressing up as a woman, but I thought it was a normal, slightly morbid thought, sometimes I would imagine myself as a girl and masturbate wildly, I had a small penis, about 13 cm, everything went normally until one day I decided to give the relationship a twist, I bought a dildo about 20 cm long, just like I ordered from the internet, I didn't expect there would be such a difference between the sex toy and my penis, when I told my partner, she showed a bit of skepticism, saying she loved my penis, but on the afternoon when it happened, I didn't show it to her at first, instead we gave each other minutes all day long, and when it was time to penetrate her, I said lie down on the table, she got naked and I started penetrating her with the intention of dilating her vagina, to avoid her feeling uncomfortable, I covered her eyes with a handkerchief and while penetrating her, I started lubricating the dildo, I was surprised by its size, but didn't give it importance since I wanted to give my girl pleasure... Suddenly I stopped penetrating her and told her to trust me... I started penetrating her with the dildo... she didn't notice at first, but as I opened her up, I started licking her clitoris so it would dilate and not hurt... My girlfriend realized what was happening but didn't say anything, she was enjoying a good cock in her interior... I started penetrating her with the dildo more and more strongly while licking her vagina, causing a rapidly explosive orgasm that I had never seen before, her legs trembled and she moaned like never before... A moment surprised me, however I also got excited... She took off the eye mask and when she saw the dildo and my penis in comparison let out a laugh, from then on everything changed, she preferred that I penetrate her with the dildo since it came faster, I was delighted to please her however one night I wanted to be the one giving her pleasure, much was my surprise when penetrating her with my member, this slid easily through her vagina and would come out when I tried to give it hard, we both laughed and continued with the toys, but things complicated on vacation, both of us forgot to bring toys and at sex time my penis didn't fill her up like before, under such pressure I had to go through what had to happen, lack of practice ended in a premature ejaculation, with nervous laughter we covered it up, but that would be one of the last times I penetrated her because on the next night my penis wouldn't even stand up, I tried to get an erection but it was weak, my girlfriend saw me masturbating trying to lift my cock and laughed loudly, trying to be a good girl she wanted to give me oral but when she got close I noticed with curiosity that my penis seemed smaller... Is that the case?