Imply head_on_another's_shoulder -> head_rest

BUR #18846 has been rejected.

create implication head_on_another's_shoulder -> head_rest

Seems to be a type of head rest.

This bulk update request is pending automatic rejection in 5 days.

This bulk update request has been rejected because it was not approved within 45 days.

The bulk update request #18846 (forum #249705) has been rejected by @DanbooruBot.

There are a lot of cases in this tag like post #6692218 or post #5908127 where the head is not resting.