The bulk update request #11705 is pending approval.

create alias cumming_onto_feet (57) -> cum_on_feet (11568)
create alias cumming_on_feet (2) -> cum_on_feet (11568)
create alias cumming_on_paws (1) -> cum_on_feet (11568)
create alias ejaculating_on_feet (7) -> cum_on_feet (11568)

Reason: Pretty much equivalent tags.
The only case in which they may be validly distinct from cum_on_feetis when a character is visibly in the process of cumming on feet - but that can be filtered with cum_on_feet ejaculation or similar combinations, and so I don't think it requires a separate tag.