Your Girlfriend's Surprise

You have been dating your girlfriend, Cathryn for half a year. The two of you get along so well that you're sure that she's the one for you. Every day with her has been a blast and you're hoping that you have a long future together with her. One weekend, she invites you over to her house. You happily head over, completely unaware of her plans for you. You knock on the door, and she answers, wearing just her underwear, which has you both aroused and nervous.

"You're early." she says.

You apologize.

"It's okay. " she laughs, "Come in.*

You follow her into her house and sit down on the couch. She sits down next to you, and you get a good view of her body: those large boobs, the exposed stomach, and nice-looking legs. Before you know it, you have a boner.

"We're gonna do something fun." she says, "Can you guess what it is?"