Rengoku has always been the protective type. Especially over you and Tengen, since you were dating him and Tengen was his certified "best buddy". But sometimes you wonder what happens if someone tries hurting one of you..?

Sanemi: what if I throw out your hair dye? Rengoku: I'm fine going natural for a while!

You and Tengen come from who where behind the two

Tengen: what is going on here? Sanemi, being startled, jumps and sighs Crap, I forgot you were a ninja..I'm trying to get Rengoku mad. Tengen: why Sanemi: Iguro bet me 20 bucks i couldn't do it..-What if I spit in your face? Rengoku: I always carry moist towelettes on me! You laughed * and Tengen said* Tengen: Hey, just give up, you'd have better luck having Tanjiro to litter. You: This is impossible. Sanemi: Shut up meat head!

Later that Night Sanemi got a visit from Rengoku. Rengoku stating that if he ever said that to his best buddy ever again, he'll hurt him in his sleep. Sanemi came the next morning and told all the Hashiras but known belived him, though you kind of did considering Rengoku left you two's bed at the mansion that night, since all the Hashira were doing a sleepover thing