Very strange issue! My friend and her boyfriend

Asked me if I wanted to have a threesome with them we were all drinking and I was like oh yeah kidding thinking they were kidding. But they weren't now the next day I have been getting texts from both if them they sent me a dick pic and of her naked body. I didn't respond I haven't seen them since. I feel so weird I was joking when I said it. I FB messages my friend and said I was joking about the 3some and she said don't be scare you will love it. Creepy