More about videos, for now I'm experimenting with extremely simple loops to replace the 2 alternating images thing.
The advantage: it's much better than 2 alternating images
The disadvantage: it doesn't allow for more interesting animations, these need several seconds where several loops are repeated, but with subtle differences between them, with different things moving at different speeds, etc.
The problem with bigger loops is that I don't have the hardware to render them, so I think I'll stick with the simple loop just to give a basic idea of movement for now.
For example, I've attached a animation to this message, it's the handjob scene from chapter 13, but with only 10 frames per second (it's just a test). I needed 25 minutes to render this "animation". If I use this method, I'll render at 24 frames per second, so it'll be 1 hour just to render a simple 1-second loop.
As you can see, the body of the MC and the girl are totally static, only her hand and his penis are moving. This kind of simplification is necessary because of the extremely short loop. To make everything move properly, I would need several loops in the same animation, at least 6 'handjob cycles' (so I could, for example, have the MC inhale air every 3 cycles, and release air on the other 3 cycles, creating more movement), and unfortunately spending 6 hours rendering a simplistic handjob scene is not feasible at the moment.