Co-Topping

Co-topping is a common term in kink for when two (or, rarely, more) people both top the same bottom in a scene. For instance, if two people are both tying someone up, they would be co-topping that bottom.

This is generally used specifically for kinky play (whether sex is included or not), rather than sexual intercourse or positions. Two people having sex with the same person wouldn't be considered co-topping unless kink play were involved with the sex. For instance, two women wearing strap-ons and both pegging their bottom while they (consensually) humiliated him for being "their bitch," would be considered co-topping even though sexual intercourse were being performed.