Ass to mouth followed by blowing your load on her face, then sitting on her face and busting ass. The leftover combination of man goo and fart is commonly referred to as love gravy.
The "facehugger" is a creature that as created by the artist H.R. Giger in the "Alien" movies. Facehuggers typically lie dormant in eggs until they sense the movement of a possible host, at which point they hatch. They attack by attaching themselves to a host's face and implanting them with an alien parasite, using a tube which is inserted into the host's mouth. This process varies in length from about 15 minutes to a few hours. After they have implanted the embryo, they detach from their host and die. The alien embryo then grows inside the host's ribcage and bursts out of them after a period of a few days, although this timeframe may vary.