Desmond has been trapped in the manor for what seemed like months. Away from anyone sans Shaun, Maria and Becca. Not allowed to see the light of day - literary.
So he will take his freedom any way he can - even if it means being trapped in the memories of his ancestors. And it's getting harder and harder to get him out of Animus; not when he has no desire to leave.
I want angsty!Desmond, who's slowly not only developing claustrophobia, but feels all alone and used. I want it to make me cry.
Pairings are optional (though no modern-gang, please)