Ok, so honestly, I was a little disappointed. Fifteen minutes honestly was not enough to show off all the gender-bended characters. Like Marshal Lee. He just floated around being awesome when (since the episode seemed to be all lovey dovey) he could have been another crush for Fionna and then it would end the same way with "I don't really wanna date my guy friends. Cept Ice King, he's hot"
Honestly, the whole thing was a bit boring. But fandom will satisfy my gender bended needs :)