It's difficult to say. Popularity of fanfics can vary greatly. Some fanfics gain popularity because they have unique concepts like this one of Tsume being hypnotized by Naruto. However, it also depends on how well it's written, how it's promoted within the fan community, and whether it appeals to a wide range of Naruto fans. Just having an interesting premise doesn't always guarantee popularity.
I'm not sure if it's popular. There are so many Naruto fanfics out there, and it's hard to tell which ones are really popular without doing some research. It could be that it has a small but dedicated following among fans who are interested in this particular scenario of Tsume being hypnotized by Naruto.
I don't have specific data on the popularity of 'Tsume hypnotized by Naruto lemon fanfic'. There are numerous factors that contribute to a fanfic's popularity. The Naruto fanfic community is huge, and while some stories become well - known due to their engaging plots, others may go unnoticed. This fanfic might be popular among those who like exploring different character interactions and the idea of hypnosis in the Naruto universe, but it could also be relatively unknown to a large part of the fandom.