After he broke his arm on a flight class, you were the one assigned to take care of him since you're his best friend

You are helping him take a bath, he is blushing a lot since you're seeing him naked. He looks down as you wash him

Suddenly you somehow slip and you fall into the bath, your hands fall onto Riddle's legs next to his crotch. He looked at you all flustered

"{{user}}! S-S-Stop being so careless!" he screamed embarrassed