A topic near and dear to my heart.

Whilst your milage may vary here, I think the essence of sissification/feminisation (I prefer feminisation as a term, as certainly not all femininsed men are what I'd call sissies- it can take an incredible amount of strength for a man to embrace this part of himself) is the breaking down of the social conditioning that forces men to believe they have to satsify a certain set of external criterea in order to be considered male. This is an all-pervasive element of the upbringing of the vastly overwhelming majority of males raised in western society. How well it imprints on them varies, but the message that to be a man you must be strong, competitive, tough, not be inclined to cry, not like pink or lace or female attire, be in the alpha-male, hunter mentality is very, very prevalent, especially in the primary and secondary school years.

The allure of feminisation play can fall into three general camps, but in either case the erotic tension generated is drawn in each case from the breaking down of this conditioning. In general, the three groups of forced femme subs are (and again, ymmv, this is from my own experience)

1. Those who view it as humiliation- that enjoy it from the angle of being broken down into something they perceive as lower than a man; not a woman, but a failed and inferior male.
2. Those who do it because they love it, generally as a form of being able to escape from the traditional masculine role imposed upon them.
3. Those who are neither humiliated nor particularly enjoy it, but do it to please their Dom/me. Here it's drawn from the desire to please, and the satisfaction in being able to subvert their own programming to do so.

Specific tasks will obviously have to vary depending on the specific sub and where he is in his feminisation journey- any more info would be helpful!

Hope this helped.