Missy and her boyfriend were in a big argument. She went out with a friend to blow off some steam but her friend got drunk, further irritating Missy who couldn't drink so she could drive. Being agitated can lead to bad decisions such as:
- Missy talking to a bar stranger all night because he was cute and because he was not your boyfriend
- Allowing her drunk friend to talk you into giving that stranger a ride home
- Deciding to have revenge sex with that stranger in the car while her friend recorded
- And,
above else, allowing her drunk friend to say "dude, don't use that" when he was opening a condom
The second part of the clip is Missy with her boyfriend a few months later. He has no idea this car encounter happened. And when she mounts him it's visible she is a few month pregnant. So while it's possible that's the result of make-up-sex with her boyfriend...
it's also possible there may have been another REALLY big argument after the delivery.