The vending machine should appear in a few days, but the prices will go up.
while taking off clothes, the mouse cursor should change to "clothes on hangers", and a "Return" button should appear on the side, if the right mouse button does not work, then click on the button. Then click on sister and select "hand".
Watch the awakening bar (blue under the hearts) carefully, when it reaches about 75%, the hero will put on clothes on the set and go to bed. Also, do not click on the removed things, otherwise they will be put on.
It seems that as long as the "Return" button is visible on the screen, right-clicking will cancel whatever function has been chosen, but only after the dialogue text has disappeared, otherwise right-clicking only hides the text. Sometimes, and I'm not sure what the conditions are to cause this, "Return" will either not show up with the dialogue text at all, or it will almost immediately disappear before the text is even off the screen. If either the hand or eye is the chosen option, and the return button doesn't show up at all or has disappeared from the screen, right-clicking to cancel will not work. As long as the return button is present, right-clicking will cancel the function, but mousing over interactable parts of the body may still change the cursor to the previous selection. It doesn't always happen, so I'm not sure what causes this, but selecting the initially chosen option a second time will cause the return button to appear and remain on the screen for much longer, and when cancelled immediately with either a right-click or by left-clicking on the return button, the pointer doesn't seem to change to the hand/eye when mousing over her body. What seems to be consistent regardless, is that once the return button is gone, right-clicking no longer works for any of the interaction options. The only way to select a different interaction option at that point is to mouse over to her side near the top of her shorts where the normal pointer appears and left-clicking on her. The menu will show up, but mousing over her body definitely still changes the cursor to the previous option (hand or eye).
If I choose the clothes option first before anything else, right-clicking only works while the Return button is visible as with the hand and the eye, and the pointer remains the pointer no matter where it's positioned and doesn't toggle to the clothes while the menu is visible. The difference is that if clothes is selected, and the return button disappears, the pointer shows the clothes no matter where it's placed on the screen and will never switch to the regular pointer, while the pointer only changes to the hand or eye when hovering over a part of her that is interactable. Once clothing is selected and the return button disappears, it cannot be cancelled or changed to anything else.
Interestingly, if I select the hand, and then mouse over to her side and left-click with the normal pointer, I can get the menu to appear and select clothing. Then, when I mouse over her body, the cursor will toggle between the hand and the clothes, and I can both remove clothing AND touch her. Since I never get the regular pointer no matter where the cursor is on the screen, I can't do anything to make the menu reappear or to cancel the hand/clothes. Because her thighs are touchable, this means that her panties can only be pulled down but never completely removed.