Too many tags are currently being used to describe a character's head between another's breasts. There's between_breasts, which, to be fair, can apply to objects as well, but then you have tags like head_in_cleavage, head_between_breasts, and breast_smother, none of which are aliased to one another. Motorboating also has no implications. Surely there's a way to simplify/optimize these tags.

In the same vein, you have tags like between_butts and sandwiched, as well as between_butt, butt_smother, facesitting, stinkface, and head_between_cheeks.