I'm reading [this story](https://www.wasabi-jpn.com/japanese-lessons/1-2-the-
north-wind-and-the-sun/) and am trying to understand the structure of this
sentence:

> 二人{ふたり}とも自{じ}分{ぶん}の話{はなし}ばかりして、人{ひと}の話{はなし}を聞{き}きません。

In the second part, 話 is used with the direct object particle を as I would
have expected. But in the first part, where I would also have expected 話をして,
there's no を. Why is that? Apparently ばかり is also a particle (says [this
page](https://www.thoughtco.com/japanese-particle-bakari-2027853)) – does it
displace を, like は sometimes does? But [this page](https://www.wasabi-
jpn.com/japanese-grammar/expressions-for-numbers-and-amounts/#3) says that ばかり
can be combined with が and を.
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question
grammar particles particle-を
Why is there no を in 二人とも自分の話ばかりして?