friends with bonuses 

Similar to friends with benefits but more infrequent; maybe only several times a year. Benefits, like with your job, are something that you can always rely on. With bonuses, it's generally a surprise and maybe only one or two times per year, typically around the holidays.

We're not friends with benefits, we only make out around the holidays. We're more like friends with bonuses.

friends with bonuses by SUPERMANrs September 26, 2010