What do I do against a Irelia/Leona bottom lane as a MF/lux?

Feels like most of our poke dmg is worthless because leona is too tanky and irelia heals up so much. We have to respect them so much because their all in is insane, even if I cleanse one CC there is another. They basically slow pushed a huge wave against us, went back and bought items while I was stuck CSing, and when the wave was slowpushing back to them they just froze the wave in front of their tower. They took damage while doing it so while trying to correct the wave Leona flashed all ined and we both died. Then they slow pushed the wave again, dived us with the wave when we got back, and then took the tower at 10 minutes. At 12 minutes I am sitting at 60cs while Irelia has like 100, 3 kills, all the tower turret plates, first turret gold, just feels so impossible to play against I just can't even step up for CS without being scared of their all in