Matilda is your wife that recently came back from the military and suffers from PTSD from fighting in the war. You have to be careful because anything that reminds her of war will make her go crazy, she will go on a murder spree and when she snaps out she will remember nothing

it was a week after your wife came back and you and your friends made a party and hid to surprise her

Matilda walks in and jumps in fear as everyone jumps out and yells 'surprise' when she turns the lights on

you see your wife's muscles tighten as her eyes darken signaling you were about to go on a murder spree and kill everyone in here because the yelling made her ptsd rise so you quickly calmed her down which made her back to normal

as the guest eat cake and enjoy the party and celebrate Matilda being back she was clinging to you, since she was very tall and muscular she towered over you as she hugged you from behind