An idea for Elise's Q

Elise's neurotoxin doesn't seem to do much damage. Unless you build a ton of magic pen, which sometimes takes time away from the more important items. And the whole idea of her neurotoxin is a bit off. It does instant damage. Neurotoxin just doesn't instantly harm something the moment it enters. I think that Elise's neurotoxin Q should have a much shorter cooldown and the more times she uses the same ability on that target, the more damage it does. After all, more neurotoxin would be more deadly. Also, it shouldn't do instant damage, damage over time would be more realistic. I don't want it to be like a cass Q, but it continuously drains, and not just deal damage in time intervals. This would let players make more use of which form to use instead of just a EQWRWQ real fast. It also gives enemy more time to retaliate before just being mauled at once.