Tsunami explains

You can't believe what you've just heard. "Wait. Are you saying that you're pregnant with my child?"

Tsunami nods.

A myriad of emotions swell in you. "I'm going to be a..." you test the word on your tongue. "father?"

"That's right. You came inside of me a lot all those times, that I thought you really wanted to give Inari a sibling," Tsunami said playfully.

You bowed. "I'm sorry! I should've been more careful."

"But you really enjoyed doing it with me right?"

"Yes!"

"So, you're really not sorry,"

The statement caught you by surprise that you didn't know how to respond.

Tsunami's expression softened. "I'm kidding."

"But what did your father say?"

"He's livid of course, and wanted to know who did it. I told him that someone performed a yobai to me when he and Inari were away,"

As far as you know, a yobai, or a night visit would involved a man visiting a woman in the middle of the night where they might have sex. While most women knew the identity of the men who visited them, you heard stories from Jiraiyaa about men and women who simply did just for the sake of sex, even without knowing the identity of each other. Heck, you had seen your perverted teacher went into a house one evening, only to return the next day; when you asked, he answered he didn't know the widow he slept with.

But what you and Tsunami did was no a yobai. The closest thing that described what both of you did was a honeymoon where a couple spend as much time together possible, which also implies having sex as much as possible. "That's not a yobai."

"He doesn't have to know that."