Hug them at same time! X3

Go to play videogames with them

They sound like a great partners for a football game!

Joke with them about how popular are their butts for the people

Obviouslly, swim with them in a pool!

Try to ambush them or one of them into a muddy clay lake! XD

Just talk and have great time with them

Request their teaching about freediving or just swimming (i would do that, i don`t know how to swim)

joke with costumes with them, as they does sometimes

Other (what?)