Koi ni mo Naranai.
Seme found uke crying (on whom seme accidentally poured bucket full of watter) over dead Goldfish which was killed by seme's cat. The goldfish was given to him by his step brother whom he has unrequited love for. "Tell me if you find that cat." "Umm, what will you do when you find that cat?" "*Smirks* I'll pulverize it." And so the story begins... PS: Uke is a Tsundere but he is also Frank and honest. He forgives seme (knowing from the start that cat belongs to seme) whilst being trapped in unrequited love. He managed to moved past the death of his goldfish a symbol of his crush and accept new love (Koi). He is different than usual tsundere ;) a warm tsundere kinda.
So Cute?
I Only read 1st couple's story. And zoomed through All other stories, they are yet to read.
Papa Wolf and the Puppy
Read till ch 36 Similar yaoi manga (vibe wise): Dakaretai otoko ichi ni odosarete imasu. (Dog is like seme Junta, wolf is like uke Takato)
Waltz with a Black Cat