[Sentaro]

Ryohei started laughing extremely loud and patted Tsuna's back a bit too hard. "Haha Sawada you're really funny. Punches are supposed to hurt. So what do you say?" He replied not backing off from his suggested sparing. But at the same time he just wanted to separate Tsuna from his lovely sister. Sawada was really extreme so he probably would just make Kyoko worry or even cry and he swore to never make her cry so he had to stop him. You could say it's his duty as a big brother.