The New York City public school principal nicknamed “Creepy Bill” for allegedly sexually harassing employees and at least one student has been hit with a new lawsuit accusing him of groping a teacher and sending her thousands of disgusting text messages.

William Bassell, 66, allegedly “groomed” the woman and forced her to endure “relentless harassment and retaliation” — including regularly feeling up her inner thigh and once grabbing her breast outside of a school prom, according to the federal lawsuit.

Bassell — principal at the Academy of American Studies in Queens since 2011 — is also accused of bombarding the employee with 30,000 suggestive missives, contends the suit filed Wednesday.

“You know what you can do with that tongue don’t you…,” said one text in the filing, complete wit

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