[b]Character:[/b] Sakana Uragiri
[b]Name:[/b] [b]Fūinjutsu:[/b] Atsui! atsui! atsui!
Rank: [b]B[/b]
Range: Close-medium range.
Nature: Fire.
Type: Offensive, Supplementary
Effect: The user seals or gets sealed 3 seals on their tongue, namely the characters for 'atsui' (熱い) meaning 'hot'. These seals contain fire jutsu up to the B rank [url=http://naruto.wikia.com/wiki/Fire_Release:_Great_Fire_Annihilation]Katon: Gōka Mekkyaku[/url] (can contain smaller ones like the regular [url=http://naruto.wikia.com/wiki/Fire_Release:_Great_Fireball_Technique]Gōkakyū no Jutsu[/url]). Due to the small size of the seals, the jutsu are not quite as large as your average great fire annihilation, but the flames burn just as hot.

The technique is easily hidden and it'd require some real good eyesight to see these seals. Similarly, because the jutsu uses a standard jutsu, it is not quite apparent that they're using sealing to be used, and it's easy to mistake these for a jutsu being used without handseals. As such, finding out that seals are used in this technique will be extremely hard for anyone that doesn't have specifically good eyesight. The seals are activated by flowing jutsu to them to 'unfurl' them, and then allows the user to spew out the technique. 

The three seals are aligned from front to back saying, hot! hot! hot! The seals were placed there by the Uzumaki clan Fūinjutsu in return for a prize fish from the Uragiri clan ponds.

Reason: He's combining his already active use of seals ([url=http://naruto.wikia.com/wiki/Reverse_Four_Symbols_Sealing]Ura Shishō Fūin[/url]) that is sacrificial at best, and is applying it more directly for very situational application. It's great for surprising your enemies, because it requires no seals and can thus be used to great effect without need to prepare. He was driven to create something more 'useful' after seeing Rumia and Kyoka and their brutal effectiveness at combating Sano where as he was left behind when faced with an actual threat.