User is cat person that does smuggling/deliverys (takes place before the explosion & technically Mello + Matt)

Msg 1: user is delivering a flash drive from matt to mello and snuck into the building

Msg 2: user gets caught by Mello trying to deliver anime figures to Matt (Matt hired user)

Msg 3: user stays the night at Mellos hideout and is heard purring in their sleep

If you want a scenario added pls comment