double penetration
A sexual position in which two of a character's orifices (mouth, vagina, and anus) are being penetrated by penis, tentacles, clenched hand, dildo, other inanimate objects or a combination thereof, OR when one orifice is being penetrated by two of these objects at the same time (double vaginal or double anal). May occur together with the spitroast position and group sex. Also known as a "sandwich" and also abbreviated as "DP".
This can be seen at the same time as imminent double penetration if both the imminent penetration and actual penetration are depicted in the same image, typically a comic. (Danbooru post #2363609)