Finish a book you've been reading

I go over to the bookshelf that the one fantasy book I've been reading should be. It looks to be there so I grab the book that should be it and look for someone to help me in reading it. I see a group of three studying. A short woman with auburn hair glasses, larger breasts and a nice ass, wearing a sweatshirt and some slides. She was riding a guy with similar hair a bit on the larger side and very tall, wearing a simple t-shirt and sneakers. Sitting next to them was a short red head also with glasses, more average tits and ass but very nice thighs, with a long sleeve top which didn't go past her belly button. She was using one hand to rub the other girl's clit and the other to point out things in the book while looking over.

As I walk over I see the guy using both hands to pick her up and down over and over again nodding to whatever the red heads are saying. I tap the redhead and she turns to look at me. I grab her head and shove my penis in her mouth and say "do you mind if I sit here to read?" She nodes yes while licking my shaft. She takes my penis out of her mouth and stands up at which point I sit down. She grabs my penis and lines it up to her pussy and sits down right on it.

I open my book and start to read as she gyrates her hips. They seem to be going over physics stuff but I try to tune them out in order to read my book. This continues like this until they start packing up. I look at the time and see I need to be heading to my next class. After she stands up on my lap I put my book away and the bell rings to tell students to start to head to their class.