IIN watching aunt shower

Very unlikely, for a couple of reasons:

1) Most women tend to lock the bathroom door when they shower if there are others in the house (although perhaps if she wanted to be perved on...).
2) Almost any woman would notice if her clean underwear was damp, or crusty.
3) It seems illogical that the aunt would leave her toothbrush OUTSIDE the bathroom to be jizzed on while she was showering.