Think about sports
From Create Your Own Story
You think about that football game you watched last night, but it's not really doing the trick. Unfortunately you don't have to try any harder because Liz's boob bouncing is slowing down. You're disappointed that the titfuck ended so quickly, but then you remember that there's a whole other set to bury your cock in as you look over at Beth.
Liz stands up and walks over to Beth; a red mark on her cleavage and boobs from all the titfucking. Your cock is no longer on the verge of cumming, and you are back at maximum erection and ready for round two. You really want to unload this load, and you are afraid you might not be able to stand up to Beth and her awesome rack.
"Okay, all clean!" Liz says to your horror as she claps her hands together. "It's been fun, see you around."
"Byyye, Stud..." Beth says, blowing you a kiss as she and her sister turn to leave.
Now not only do you not get to cum, but you don't even get to fuck Beth's massive tits! What a rip-off! Better think of something fast, or call it quits.