Why would a guy go live at his girlfriends house when she don’t own the house?

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SO MY PRIVILEGED PRINCESS NARCISSIST SISTER KEEPS BRINGING HEY SIMP BOYFRIEND TO “LIVE” IN MY PARENTS HOUSE FOR 3 DAYS A WEEK.
WHERE I ALSO LIVE!!

(What Do I Do?)
(I Feel So Uncomfortable With This Complete Stranger At My House)
(My Parents House Were I Live)
Updates
1 y
SHE DONT OWN THE HOUSE!
AND MY PARENTS won't DO ANYTHING CAUSE THEY SCARED SHED LEAVE
Why would a guy go live at his girlfriends house when she don’t own the house?
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