If "tease" means to playfully mock or annoy:
* Compliment: To praise or express admiration.
* Encourage: To give support or confidence.
* Soothe: To calm or pacify.
If "tease" means to tantalize or excite someone with a promise of something that is not delivered:
* Fulfill: To carry out or accomplish.
* Satisfy: To meet or gratify a need or desire.
* Deliver: To provide what has been promised.
If "tease" means to lightly touch or stroke:
* Ignore: To pay no attention to.
* Repel: To push away or reject.
Ultimately, the best antonym will depend on the specific situation where "tease" is being used.