>>2695157You can't get a shirtless variation without the cock, but the way that scene is stored in the game files, there is a 'headless' yoichi images in various body positions, and then a little over 2 dozen 'head' images with transparent backgrounds. The head images have different facial expressions, different details (ball gag, chain orientation, etc...).
You need an image editor that can edit in layers (ex: gimp), open up the 'body' image you want, and simply drag and drop the 'head' image you want into the workspace, and it should all line up perfectly.