So first the bomb didn't just leave all the kids the same some did stay the same but most we're given powers or genetic mutation
And it gives them weird habits
Josh-has like a Spidey-Sens but it is more of a I need to check on this kind of thing so he is constantly paranoid
Eli-has large K-9's (you can actually kinda see that he has sharp k9s in the show) but he bites people he likes so Josh has bite marks all over him
Eli is grumpy on the outside about being short but on the end side he loves it and Josh knows it
It might be weird and corney but they do a lot of classic couple things like
Eli goes to sleep in one of Joshs shirts
If Eli stays up to long Josh will go up to him pick him up (with easy because its, the apocalypse nobody is eating right) like a child and has him rest his head on his shoulder to bring him to bead
Josh is big spoon Eli is little spoon ex.
There relationship started shortly after episode 10
Eli was alive but totally out for like three weeks So Josh had time to think about how he wasn't upset about Sam and why he was scared for Eli
When Eli did wake up the first thing Josh did was confess and Eli was shocked and thought wesley said something
But form that day on they were always right beside eachother
So here are some clingy Eli headcanons
He always is wearing one of Joshs jackets
He clings to Joshs arm and will nuzzle his head in to his arm or side
He likes to have his legs crossed over Josh's
(Josh will grab his legs all the time (hes a lot more comfortable and confident with their relationship then he was with Sam if you couldn't tell)
