Is it normal my sister's girlfriend wants to cheat on her with me?

Lie

tell your sister right away

I like both the previous answers ^. Maybe your sister is afraid to bring up a 3-way with you because she's your sister. Maybe your sister is the one who wanted it in the first place and is using her girlfriend to bring you into it. (incest among siblings is actually more common than you think.) On the flipside, Kudos to you for wanting to protect your sister. The friends being brought into this just adds un-needed drama, and it seems almost like they are trying to pressure you into it. That could be pretty bad. The best thing I can think of, is to be open with your sister, and find out how much of this she knows. If it was her idea, tell her its ok, and you'll consider it. If its shocking news to her, tell her your sorry and together you'll work it out. Be as understanding as you can be.

Also, if the girlfriend's friends are causing trouble, thats a sign of something much more sinister at work with that girlfriend. She might be...what is it you kids say today..."Putting up a front" to your sister in order to get to you.

I figured I'd say what happened in case anyone cared. I told my sister what happened, and she looked upset and looked like she was thinking. She finally asked me whether I wanted to hook up with her girlfriend. I told her I would never hurt her like that by allowing someone to cheat on her. She said, ignoring that, whether I really wanted to and I'm always honest with her so I admitted yes. She told me I could do it and that she wouldn't be angry with me. I hugged her and told her I hope none of this is making her feel bad. I then talked to Chloe (her girlfriend) and told her I changed my mind. One thing about her is that she seems to intentionally want to make me feel awkward about her relationship with my sister, saying things like "imagine your sister writhing in orgasmic pleasure, I can make her moan like an animal" and "eat my pussy like your sister does". I don't know if she thinks it turns me on or is trying to make me feel weird, but she's doing the second one. My sister made the decision to accept it and continue the relationship, so long as she doesn't have to "share" Chloe with anyone but me. She probably won't have to, as this seems to be exactly what Chloe wants. After I got with her, Chloe told me that her birthday was about to come up and for it she wanted a threesome with her, my sister, and me. Obviously this request made me feel awkward and I didn't say yes. However, she asked my sister the same thing and she agreed, so I decided I would too. On her birthday, we entered Chloe's room, which has a huge collection of sex toys. Some of them I couldn't even imagine the proper use for. At first it was awkward but I got over it fast. I accidentally touched my sister a few times, but that's the risk of these sorts of things. At first the two girls scissored while Chloe gave me handjobs and blowjobs to the side. Eventually we settled on Chloe being on her back while I pounded her and my sister on her knees while kind of sitting on Chloe's face while Chloe ate her out. Chloe insisted that me and my sister be facing each other during this so we could look each other in the eyes while she pleasured us. Yeah, I think she's kind of weird. When I was about to cum, Chloe wrapped her legs around me and said "do it!". What I'm worried about is that after I came in her (I wasn't using a condom) she scissored with my sister again, without douching or anything. It probably doesn't matter. We all had fun and maybe it will happen again. It might sound bad but it's not. I'm just happy my sister is fine with the way things are going.

I know people like this. They one want to do one thing; destroy. They don't care who they bring down.

Yeah tell her you will do it on one condition. That is if it doesnt count as cheating then she should be able to tell your sister no problem.

If what this girl says is correct and that she and your sister wouldn't consider this cheating, then she'd have no problem telling your sister about her proposal to you. Suggest this to her.

If she doesn't want to tell your sister, then she was patently lying and she's not the best person to be with your sister. I think, at this point, your sister deserves to know what her girlfriend is like.

i would just go for it!!! HOT!!

Its normal for you to feel this way.
The friends of hers that think your an asshole are not right in the head. And are probably not your sisters friend but inly her girlfriends.
Maybe your sister doesn have the guts to ask you into the three way.
Maybe you should tell your sister what her girlfriend said and see what she thinks.
Maybe your an ahole for not becomein the cheeses in a incestious lesbian sandwich.