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It's not a guy.
It will eat your food.
It will eat your clothes and furnishings.
It will crap indiscriminately.
It will chew your wiring.
It will make your home smell of urine.
It will attract more vermin.
It will breed with others and multiply the problems.
The health of you and your girlfriend may be at risk - research Weil's disease.Humane traps don't work.
Poison will only give it the opportunity to die somewhere inaccessible and smell even more.
Buy a Little Nipper, polish the release arm, oil the pivots, and dispose of the insanitary vermin when girlfriend is not watching. The bags sold to dog owners are good for this. Then set the trap again in case there are more.
You could borrow one of my cats, then go out for the day, and ask no questions upon your return?
Guaranteed humane, for a given value of humane.