How to ask this cutie for his igggggggg

So i go to this language course once a week on every saturday okay and ive went there since september and me and this guy was the oldest in our class others were pretty much 12 or 11. And when i first saw him, i didnt really thought he was cute but then i realized how cute he was last saturday😢😢 And our course only has 2 lessons left which means 2 saturdays and then no him. We dont even talk, so how do i ask him for his ig?? What if he saw me in sept and thought i was rlly chopped🥀🥀😵😵