Down her throat.

You give Kate another orgasm as you push against her against the wall. She screams now, obviously forgetting the two of you are in a public campus locker room. Before she can come down fully from her climax, you spin her around and push her onto her knees. Her eyes open wide and look up at you as you line up your cock with her lips.

"Suck my cock Kate," you say as she obliges and opens her mouth to swallow your head. Her tongue lashes out around your cock, coating it with her saliva, the shower quickly washing it away.

You can't take the teasing anymore, and push your cock further into her mouth, entering her throat. Kate gags - you could prevent this if you wished - and brings her hands up to your thighs, pushing you away lightly. You do not oblige, and continue to fuck her mouth. You cum, shooting down her throat, Kate with a screwed up look of effort on her face as she struggles to take you in.