He gives in.

"Professor, it is good to teach me to love God and respect my body, but can you not see that I love you?" She lay back on the pew of the abandoned church with her legs parted wide to give Nightcrawler a good view of his desired lust.

With a <Pfft> of smoke, he appeared, not atop her, but completely inside her. Her artificial hymen tearing in an instant as the erect shaft of her sons cock appearing in a sulferous cloud inside her. Mystique had to admit her son has pleasure and allowed herself to fully enjoy his somewhat awkward thrusting.

Nightcrawler, filled with guilt for taking this young girl's virginity and the same instinctual lust that all mutants now dealt with spent himself in the womb of his mother. He did not know this as years of sexual repressed urgency spilled into the form of his young student, but he had given his mother one of the final pieces she needed to create the ultimate mutant.

When he awoke, she was gone.