24F Bi. Couple I have been friends with often joke around about having a threesome, I realize now that they are being serious. I am not interested, what do I do?

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The original was posted on /r/sex by /u/Organic_Ad6606 on 2023-06-27 14:21:01+00:00.

I met this couple a few months ago who used to joke around about having a threesome together. I told them that I was a lesbian (as I have been asked for a threesomes in the past and it makes me incredibly uncomfortable). They are very kind and sweet and have been relatively respectful of my boundaries. I feel as though it is my fault that I used to play along with their “jokes” assuming they knew I only liked women and wouldn’t actually expect me to be okay with it.

Recently they have have been more forward with their approach and I am starting to realize that they are not joking. My tipping point was when a few of us went out and got drunk and the girlfriend tried to kiss me a few times. At one point, I gave her a quick peck on the lips but she quickly put her tongue in my mouth and I pulled back immediately. I think she was slightly offended by this. I distanced myself from them that night but they have now heavily suggested that it’s going to happen the next time we go over to their place.

I feel like this is my fault because I naturally have a very flirty personality and used to play along as a joke (I’m like this with most people). Most of the time I just laugh it off.

Other than this, they are incredibly sweet and kind and have helped me out more times than I can count. I enjoy my relationship with them and don’t want that to be jeopardized. I am also feeling down that I feel like that was the only reason they wanted to be friends with me.

How can I have a conversation with them about this and try to maintain a relationship with the both of then without offending anyone?