Kamui's Intangibility let him pass straight through brick and stone walls.
When Naruto silently appeared in Shikamaru's boudoir, he found that Big Sister Little Deer wasn't home.
Seeing this, Naruto felt no disappointment. Instead, he breathed a sigh of relief.
He strolled to a corner of Shikamaru's room and left a Flying Thunder God Mark in the least conspicuous spot.
Then his body became intangible again.
Naruto first paid an uninvited visit to the Nara Clan, followed by the Hyuga Main Family and Hyuga Branch Family, the Inuzuka Clan, the Aburame Clan, the Yamanaka Clan, the Akimichi Clan, the Forged Iron Family... and Konoha's other major clans with Secret Techniques.
He nearly ran into trouble at the Inuzuka Clan.
He had wanted to tease the soundly sleeping, nicely developed Kiba Inuzuka, but Akamaru noticed him. In the end, he had no choice but to leave a Flying Thunder God Mark and hurry away.
During these uninvited visits to his classmates, only Kiba Inuzuka, Hinata, and Shino were in the village. Most of the other members of the Konoha 12 were out on missions.
Not getting to see the feminized Big-Sister Neji left Naruto a little disappointed.
Big-Sister Neji
Actually, when he first visited the Forged Iron Family and didn't find Tenten, Naruto had guessed that Neji wouldn't be at the Hyuga Branch Family either. After all, Tenten, Neji, and Rock Lee were on the same team.
That was right.
Tenten's full name was Tenten of the Forged Iron Family, and her family was Konoha's largest supplier of Ninja Tools.
"Tenten of the Forged Iron Family, forging iron every day? Interesting, interesting."
With that, Naruto instantly used Flying Thunder God and returned to his own room in the Uchiha Clan Compound.
"Even though I didn't get to see feminized Neji... now