What is this sex act called that involves MFF?

OK I don't have any pics or videos of this sex act,but I can try to describe it.

In this MFF threesome one girl would get fucked in the pussy by the guy,usually in a reverse cowgirl position I think, and they keep fucking for a bit. The second girl would walk over to them and try to lick the first girl's pussy while she is still getting fucked by the guy.

I've seen this before in some porno videos but I have not idea what this is called. Do you guys know the name of this thing?
 
Top