The position lets Anny dip her head forward to suck Oliver off at the same time, creating a 69 that is hot as hell and so mutually satisfying.
Damon tries to say his wife is in the other room, but Anny points out that he's already on the naughty list so it can't exactly hurt anything.
Anny rolls her eyes and explains herself to Damon, who doesn't believe her until she demonstrates a little bit of her Christmas magic.