Remove the codpiece.

You snap your fingers, and the bit of armour pops right off and bangs off the floor. He looks shocked and embarrassed as he bends down to pick it up, but you're quicker. You lift it up and place it into your magical bag before the two of you stand back up and stare awkwardly towards each other. Your eyes wander down, and it seems as if his trousers depend quite heavily on the codpiece, because you can easily see the outline of his erection through the fabric.

He looks down and immediately notices, lowering his hands to cover himself up. Words start to escape his mouth, most likely an apology, but you cut off his flustered stuttering.

"You really are enjoying yourself, Bav," you whisper as you curl your finger through your hair mischievously.

"I'm sorry. I don't know--... This doesn't usually happen."

"Mhm," you hum as you twist your fingers behind your back. You take the spell which causes a stroking sensation to shift up and down his member, and put it on auto-pilot for now. Next, you raise your hand up, and slowly undo the top button of your blouse, teasing only a tiny bit of your skin.

Clearly, he's aroused. His face is flushed, and his legs shift back and forth in an uncomfortably manner.

"Wait a minute... Are you doing this?"

You shrug with no answer, but you're fairly certain he knows.

"Heh. Let's stop this and go home first, huh?" he whispers as he looks left and right. "This is a little weird in public."

With a twirl of your hand, the sensation speeds up, leading him to gasp. After a few minutes more of teasing him, and slowly speeding up, he starts to look to you with begging eyes.

"Please stop. I'm going to..."