Alright, everyone went with Keith. Here's the plan since I liked your guy's Ideas:
Keith and Pico will go to the park as planned but will go to the restaurant later where Senpai is a waiter there, who will flirt with the "ugly worm" (aka Keith) and Pico will get jealous lol.
And to not spoil too more much, I am saying this will bring up the (finally) smut chapter everyone was waiting for due from Pico's jealousy. I won't say how though, hehe.
Anyways, thank you for the ideas! Credits go to the commenters I got the ideas from.