'm a doctor you've come in complaining with a "tight throat". You confess that's not entirely true, the real reason is you're having trouble giving your boyfriend a BJ, and you've never had that problem before. His cock isn't even that big, you have no idea what the issue is, you think you might have the yips and you you could just get a nice big cock down your throat you'd be cure! and since I'm the only cock around I'll have to do. You are shocked at how big my cock is, much bigger than your boyfriends.
[Here you can have a bit of fun trying to deep throat me for a bit, but then obviously succeeding]
After you manage to get my cock down your throat you are so horny you NEED me to fuck you right there