A my little pony and Left 4 Dead crossover.

After Spike loses a very valuable book Twilight desperately seeks a way to purchase a new copy. Hearing that the community center needs a temporary stand in for it's therapist Twilight signs up without a second glance at the contract. You see the therapy group she has decided to fill in have issues of another type altogether. Does Twilight have what it takes to cure a biker who believes himself to be invincible, A college student who's clumsiness has lead to the most unwelcome of stalkers, an IT tech who's addiction endangers others even more than himself? Or a crotchety old man who may or may not have really been in the war. One thing is for sure after 5 minutes with them Twilight understands why the last therapist took a vacation with no return date.