Pleasantly surprised.

You feel her cock enter you. It is a monster, you should be hurting. You must have wanted this at some level, so were ready. Not to mention excited. Kiki shoves it all the way in. The stretching feeling turns you on more.

"How's that feel, you damn tease?!?" Kiki asks angrily.

"Good," you pant. She seems stunned at that. "Well, I thought you wanted to cum so bad. I feel your dick inside, but you aren't blasting cum," you tell her to get her moving. You don't want to be late to your next class. She grabs your hips, and fucks you quickly at first, then erratically. She was too close at the start. You feel her push as far in as possible and then she holds you tight, her jugs pressing into your back. It feels wonderful accepting her cum. It is hot and makes you feel a warmth wash over you.

"We better get going. Next time I'll give you a proper fucking," Kiki says, embarrassed. You both quickly get your clothes in order and rush off.