Second adc of choice

hello guys.

Im not a adc main and never will be. Sometimes when i have to play adc, i'd say (LoL) i "main" sivir. I can play other adc, but sivir seems to be good vs the other i can play. Graves, Ashe and Cait are 3 adc i have great succes with.

I have good enough skill on Kog Corki and Ezreal Ezreal was my most played champ season 3, idk where he stand at this year almost never played it. I wish id be good at draven and kalista but ill never spend enough time to ger good at it, means at same time forget bout lucian and vayne.

Ok, now the question, Who should be my second adc... The adc ill have to pick in most cases because sivir is picked and some rare cases, sivir banned.

Thanks