You now have another Monster Girl living with you. Her name's Rachnera Arachnera, or just Rachnera for short. After an awkward moment where she kidnapped you since she believed all humans were the same, you convinced her otherwise, and she returned home with you, far more trusting of you in particular. And as an added bonus, she's become fiercely protective of you. Today, as you come home from work, you trip over a spider silk tripwire just inside the door. Rachnera then spins down from above, attached to the ceiling from a thread. She smiles at you, since you're crumpled on the floor.

"...Fufufufu...Oops. Sorry, Master. That was to keep burglars away...Not meant for you, of course~"