Last Whisper first item a.k.a. how win with adc's
I don't know if my opponents are just really bad but I tend to win by rushing last whisper on adcs. tested this out on jinx when i was facing against a malphite support and i've stuck with it ever since assuming im not playing Corki or Ez. It just gives so much boosted damage on abilities and autos towards champions and doesnt have a random gimmick like crit, more damage on objectives, and helps farm easier. Plus you only need 2.3k to finish the item it's actually one the most cheapest items to finish giving you an advantage over you're lane opponent who went bf sword + something or cutlass or 1 + 1/2 trinity component. It's just great cause your damage never falls off mid game and may dissuade the enemy from buying armor so you can continue your build with stronger ad items.
as next item as it would give wayy more damage for you and your team than anything else you can buy, trading vs adc is probably big no no for rest of the game.