When a character feeds from a penis in a manner similar to nursing from a mammary, either knowingly, be it by taste for sperm or lack of nutrition alternatives, or unknowingly by mistaking it for a teat or a bottle.

Often (though not always) associated with father_and_son/father_and_daughter incest and toddler/baby. Can be compared to a specific kind of penis_milking using mouth.

Not to be confused with any shallow fellatio. The sucker is only trying to milk the giver's genitals, regardless of pleasure.