Poll: I caught my girlfriend making out with her step brother in my apartment again. How do get them to stop? This is like the third time.?

She says it's harmless stuff and they're just close, but I notice they use their tongues and do open mouth kissing. Also, he's always coming over when I'm at work. This time they were both on my bed, him with his shirt off and she with just her bra on top but pants on. It's kinda getting out... show more She says it's harmless stuff and they're just close, but I notice they use their tongues and do open mouth kissing.

Also, he's always coming over when I'm at work. This time they were both on my bed, him with his shirt off and she with just her bra on top but pants on.

It's kinda getting out of control.

How do I get her to stop inviting him by when I'm at work?

I know it's her family and I don't want to offend her but he's getting on my nerves.
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