Try to convince her otherwise.

"B'but I might not be able to do it in time for class! I have... performance anxiety?" You try to weasel your way out of it.

Lilith raises her brow. "I see. You did require my visual aid the other day. Will this do?" She lifts up her shirt, bra and all. Revealing her E cup breasts. She sways her breasts side to side, like she is trying to hypnotize you. You instinctively start stroking your large member, but Lilith seems a bit confised.

"You aren't going as fast as you were the other day. But after everything I've heard, you might have built up a slight tolerance to just my body alone." She then looks towards the rest of the class. "Would anyone like to aid Heath McCoy and I?"