Sexual Relationships 
Sexual Health 
Is my boyfriend cheating on me with my sister? If so, how could I catch them?
CloudedMind Xper 2
My boyfriend of about a year always gets nervous around my sister. I noticed he's been talking about her a lot. He asks a lot of questions about her. When we talk about her, he always has something bad to say about her, but he still talks a lot about her.. He comes over to my house all the time. Mostly to play his video games and lock himself away in my room. However, my sister comes over and walks around in her sports bra and panties (sometimes even naked because she takes baths and just walks around like that). It's frustrating. Long story short, our schedules are all jacked up. He works morning and day shifts, and I usually work closing shifts. When I leave for work, he doesn't leave. Sometimes he is home alone with my sister. He always says he doesn't do anything and doesn't even leave my room... but I'm starting to feel like something is going on... When I got home from work, of course my sister had already left. (It seems she only comes over when I'm gone at work and my boyfriend is there... ) Well when I got home, I found a pair of my underwear in the guest bedroom that she stays in (I guess she's been wearing them) and also a towel with cum stains on it. I' m wondering how that could even be possible... and I'm also grossed out she's wearing my underwear. They honestly looked disgusting... I was wondering, if this is actually going on. HOW could I find out for sure if they're really doing anything? I'm tired of feeling like this.
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What Girls & Guys Said
18 37I'm going to give your an excellent plan that my momma always told me what would happen to me if I ever cheated on the wrong girl! It'll involve you cooking some grits in the morning though...
Sounds like your sister is trying or has seduced him. Leave a camera or webcam on inside your house that activates with sound. I doubt you will catch them in the act on video but you should be able to hear them on it.
Present the evidence and ask about it.
Suddenly come home and use your key quietly for open the door when they're thinking that you're at work. Or buy a nanny cam, I don't see any other option. If it's true, that's really sucks, I have a sister too and we're literally hate each other but fucking her bf? Wtf.
Yeah..: ikr? Thank you hun <3
Whether he has done anything or not, your sister is clearly trying to fuck him. If anyone is at fault here it's her. A guy his age would find it very hard to say no to naked willing pussy.
You want to find out the truth? Go somewhere private with him. Tell him that your sister is trying to break you guys up, she is saying that they fucked AND THAT HE SEDUCED HER. If he's innocent he will deny fucking her. If he's guilty he will turn the blame on her.
Maury...
Leave voice recorders on in a few rooms. What kind of relationship do you and sister have?
Not a good one at all
Then yeah I would definitely get to the bottom of it.
Thank you for the support
You're welcome. Keep us updated. If they are doing this then omg this is one of those revenge is a must cases
Yeah but I gotta figure out first. I'm waiting for the camera to come in
Maybe you should suggest that you guys don't hang out at your place anymore and that you would like to spend more time at his place instead, and see how he reacts.
He straight up threw a fit. Okay, don't get me wrong.. he lives in a tiny ass trailer and can't afford wifi, cable, or literally anything entertaining. So I literally have to argue with him just to get him to stay home and quote unquote "be bored to tears"... plus it doesn't help that my parents say he can come over whenever he wants.
Wait, he's fucking you and your sister in your parents' house? You're yanking my chain.
https://www.ebay.co.uk/itm/262683603380 ))) check this CCTV out ;) if you can't afford buying them or doesn't ship to your country, maybe do call video Skype and hide it and put It to direct where he sit to play, or where u think they are usually having sex ^^ and from your other phone u watch and hear ^^
Thank you
Just for the record, it's completely possible the towel was just what he used to clean up after masturbating. There's not that much evidence here that suggests he's cheating
Yeah, the only real evidence about that is that it was in her bedroom. Why would he go to her bedroom to masturbate? He does that in my room. I know, because he uses towels to clean himself.
That's a good question. You could always try setting up a camera or try coming home early to catch them
Ok thank you <3