Advice for sissy cuckold to be?

Since my teens I have been a crossdresser. My current girlfriend, that I have been with for 2 years, knows of it but so far didn?t want to be part of it or even see me dressed. All that changed 4 weeks ago. Suddenly she shows a great interest in my dressing up and even wants to take part in it actively. So she helped me with my make-up twice and even bought me a pretty satin nightgown. Also she told me to shave my whole body which I haven?t dared so far because of her. We have had three beautiful evenings together at home both of us in pretty dresses watching TV, takeing wine and talking. It was really a dream come true for me.

But although I love that girl-time with her I?m alarmed by some other changes. When she leaves for work in the mornings she suddenly does more make-up and dresses more provocatively (My girlfriend is from Poland and in the past often told me that she couldn?t dress in tight tops and miniskirts as she was used to because everyone would think of her as a slut here. Now she doesn?t seem to mind anymore). Besides that she tells me more and more often about a new guy at her work. Especially on Sunday when we were both sitting on the sofa in pretty evening gowns she told me lots of things about him like that he is really tall (my girlfriend has always been attracted to tall guys and I never figured out what she saw in me because I?m only 5 ft 10 in), his charming compliments to her, his great sense of humor. I think she has probably some feelings for him.

Now that alone isn?t so disturbing to me although I feel some jealousy. I love her very much and if there was another man who could give her sexual fulfillment I would accept that but I?m so afraid to lose her to him altogether. Although on the one hand we have a great relationship on the other hand our sex life sometimes is a bit frustrating. My cock is only about 5 in when erect and I always have trouble holding an erection for more than a few minutes. She only has an orgasm with me when I go down on her or use some of her toys on her (she likes her 8 in lifelike dildo the most). So until now I thought we were nevertheless both satisfied in bed because in my opinion cuddling and caressing is much more fulfilling than the hard pounding you often see in porn flicks. But if my girlfriend needed a “real man” in bed now and then I probably would understand that and support her.

Now my problem is how and when I should talk about those things with her because I?m so afraid to lose her if she misunderstands me. I really want to see her happy and I?m ready to show consideration for her needs as long as we can stay together. I?d appreciate your advice.

By the way: Sorry for my bad English and please don?t flame me because of my mistakes but I?m really out of practice in writing.