Finn and Jake have left BMO home alone again. she starts giving her reflection which she has named "football" another lesson on how to be a real person. this time she is teaching football about sex! BMO starts by stripping, and then using 3 buttplugs, each bigger than the last, to stretch her ass. finally she cums using a hitachi with the biggest buttplug in her butt!
LOTS of adventure time references including the iconic line "it goes in my butt!"