Note that these are just a few ideas for discussion. If you have a similar idea along the same themes, please let me know and we can work something out.
Lust in Space - I was a Captain in a salvage ship. In my line of work I encountered pirates, smugglers and aliens. While salvaging a cargo of body sleeves, there was an accident and I found myself in the body of a sexy female pleasure android. Now according to interstellar law, I am officially 'property' and salvage.
The Princess - (Fantasy/Medieval) I was a member of Princesses Royal Guard. On the eve before it was to be announced that she was to be eligible for marraige, the Princess expressed that she wanted to experience one last night of freedom. Using a pair of magic rings, we swapped bodies. Now she claims that she is the real me and I am the one who will be married to the foreign Prince! I intend for this game to be more romance than domination themed.
Secretary Day - (Moden) I received a memo from my secretary that the company was having a costume party. My coworker convinced me that it would be fun to go crossdressed as a sexy maid. The memo was wrong. It wasn't a costume party. I was the only one in costume. After introducing me as the maid, my coworker 'introduced' me to my overly handsy boss. Now he wants me to be his personal secretary and his maid on a permanent basis. (Although this may start out as cross dressing, I would like the end result to be made into a real girl.)
The Pleasure Clone- (Modern / sci_fi) My wife's company was developing the latest line of pleasure clones, however they were having trouble getting the programming right. Tonight she is supposed to reveal the newest design to her investors. Then she had the idea that I could pretend to be the clone to buy them enough time to perfect their product.
Replacing his pet - I accidentally ran over a cat with my car. When I told the owner that I would try to replace his pet, I didn't expect him to take me literally. Now the mad scientist is intent on making me his Kitten-doll pleasure pet.
The Warlord - The barbarian king from the northlands has finally defeated the civilized lands to the south. To inflict ultimate humiliation and defeat upon the kingdom, he orders his wizard to tranforms the Prince of the land into his personal slavegirl. Can the new Princess escape her chains and free her people?