Grr! Rensouhou-chan is the cutest!

Hiss! My Rensouhou-kun is cuter!

First reason: Debate on Rensouhou-chan/kun's cuteness. Nominally for their own child, the gloves-off, no restraint brawl is the defining characteristic.

Also, the Rensouhous will always come in to stop them

Which of them is really the master here...

Guh!?

You...Keep away!That hurt!

Why do I have to keep away?

Huh? Don't try to command me. You're the one who should back off!

Huh? Why are you so stubborn? Are you an idiot?

Don't push my forehead! Back off!

Why are you taking getting pushed so seriously? Stupid!