It's Always Sunny in Philadelphia S12E10 - Dennis' Double Life
Dennis reveals he has a baby from his Wade Boggs layover in North Dakota. Everyone offers a solution for how to get him out of this jam. Mac suggests they pretend to be a couple and Frank wants to make the broad a "decent" proposal b/c $1 million for sex is indecent. In the end, Dennis has to decide which life he wants to continue to lead.
It's Always Sunny in Philadelphia S12E10 Screenshot