I had an idea for a desperation scenario.
A comes in to donate blood for her relative B who needs it very much. In order to ensure she can give blood with low resistance, she has drank plenty of water. The donation process takes a long time and she really has to pee, but she refuses to disrupt the donation process because of how much B needs her blood. The ending really just depends on the model and what happens.
I've donated blood plenty of times and it is not uncommon for me to become desperate during the process. As a blood donor, I find this scenario particularly exciting. It would be more difficult to film, however. I'm not sure how you'd acquire a medical room to film this in, but I thought of a few cheap workarounds:
Any white room can do, just take most of the furniture out and hang up a medical poster or two.
You can get a clear plastic tube from a pet supplies store, they have them for fish tanks and stuff.
You could run some stage blood through the tube, which would appear to be hooked up to a fake needle.
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I'm really impressed overall by the content on this site! You have really good lighting, good scenarios, but best of all, all of the models are really good at making a convincing scene! However I think it could improve a bit by having more variety of scenery and types of scenarios leading up to the situation.
Great work! I'm definitely going to have to buy something here when I have some funds left over.