This is my story and is also published elsewhere.
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Dear Mistress,
First of all let me thank you for potentially giving me the opportunity, with your help, guidance, humiliation and discipline, to fully realise my core nature of being a cuckolded, sissy faggot worthless to any woman sexually, but rather a loving, supportive partner in anything a woman chooses.
To truly understand that my small penis and beta male ways are not suitable for sexually satisfying any woman, but rather to be locked in chastity and that the only way I could please a woman sexually is by supporting her to find a real man capable of giving her the sexual satisfaction I can't. That only my oral skills should be made proficient to offer her some release when her lover is unavailable or to orally clean her vagina after her lover has deposited his seed inside her. And accept that her humiliation of me (privately or publicly), her pegging me, her inflicting pain on me and her disciplining me are all ways I can please her.
And to learn to appreciate that, whilst I am straight and will always find women sexually attractive, because I'm unable to satisfy a woman then my own sexual pleasure will only come from my being anally penetrated by dildo, strap-on and a real man's penis and will be turned into a sissy faggot so that I concentrate all my sexual desires and fantasies around cock not women. Any masturbation will only be to gay or sissy porn, or femdom porn so that I associate my sexual pleasure with being used by men or dominant females; or masturbating as I watch my Mistress being satisfied by a real man as I'm cuckolded.
To accept that I will be milked, not masturbated (unless in above instance), to release any build up of semen, thus denying me any sexual satisfaction from orgasm, and that I must always lick up and eat any semen I produce to ensure I grow to love the taste of a man's ejaculate for those times when I will either be eating creampies from my Mistress's body/pussy/ass or sucking any men who require it of me to orgasm.
To learn to take corporal punishment, accept CBT (cock and ball torture) and endure any punished my Mistress requires of me either for my education in obedience or for the pleasure of my Mistress.
Now I appreciate thst whilst this isn't a conclusive or definitive summary of my needs it is rather comprehensive so, with that in mind and, as requested, the following gives some background and experiences that have led me to this desire and need to be cuckolded, dominated,humiliated and sissified into an obedient, cock craving, pussy whipped pathetic beta male. And, at the end, I'll give you an insight into the kind of relationship I'd like to have if I was lucky enough to meet a woman.
Until my marriage (aged 27) I was a sexual active Alpha male. I took great joy in pleasing women sexually and had no complaints in that department. Indeed I was often complimented not only on my ability to pleasure women, but to ensure they were sexually satisfied before I gained my own release. With each subsequent woman I would endeavour to be the best lover they had experienced and was often told that I was. I took pride in knowing I could please a woman and my ability to control my own orgasms helped enormously in ensuring I wasn't the typical '5 minute wonder'.