imminent double penetration
This can apply to two scenarios:
1. When a character is already being penetrated vaginally or anally, but there are also signs that their remaining orifice will also be penetrated. (post #3245998)
2. When a character has not been penetrated yet, but there are signs that two people are about to penetrate both orifices simultaneously. (post #2770792)
Currently, oral is not considered a form of penetration. Only the vagina and anus are considered for this tag. Either way, consider adding other imminent_* tags depending on what's going on in the image.