Replying to Selling Smelly Shoes

So the weirdest fucking thing happened to me this morning. I got a text from a number I didn't recognize and they wouldn't say who it was beyond "someone I went to college with". First they asked me to sell them some old smelly shoes and I figured it was just a friend fucking with me but it escalated into this whole thing about how he wanted to be my "foot slave" and buy my shoes regularly once they get smelly. He/she? offered me $300/pair plus any new shoes I want to replace them. Really thought it was a scam until they actually sent me money on venmo a little bit ago. What the actual fuck. They said they get high off sniffing old smelly shoes, but I feel like he's definitely gonna jam his dick in there too.

What would you do in this situation? I'm a broke college student so as weird as this is, money is money..