Your girlfriend is up late working, really miserable about the whole thing and exhausted. She'd like to just get in bed with you and call it a night, but it's important work. So she pulls out the good old caffeine. And starts to gulp. And burp. And suddenly, your pants are pretty... snug! What's this all about?

You don't say anything. And she talks and burps a bit. Thinking it isn't working, she says she maybe will just call it a night and start fresh. But you insist she continues! Please! You'll be happy you finished! She's suspicious about your pushing her to work more.

And after some time, she finally sees it. Hmmm. That definitely is a bulge in your pants! But it doesn't throw her off or bother her, she thinks it's interesting! Your darling girlfriend needs to see how excitable you can get with her burping. So she instructs you to sit down at her chair. She's going to ride on top of your cock while she's burping!