Well, would you?

Yes; after all, you'll probably want another fuck first thing

"Actually, it might be quite nice to have you again in the morning, so I wouldn't mind you staying, as long as your parents are happy with it. What time do you have to be up for school tomorrow?"

"Well, I'll need to pop home first to change and get my things, so probably about seven at the latest. May I recharge my 'phone while I'm here, please sir? Also, my parents want me to fill in a punishment diary any day I get spanked by anybody else, because they say I'm going to get double from them on top, so is it alright for me to finish that before I turn in?"

Being an academic, you tend to lie in as late as possible most days, but seven sounds perfect for a quickie before work, so you tell her that's fine and to go ahead with the other things she mentioned, too. However, so that she doesn't waken you by getting into bed afterwards, you say she should get a blanket from the airing cupboard and sleep on the floor. She thanks you and kisses you on the cheek before saying goodnight and tiptoeing out of the room.

You're so tired after your long day that you fall into a deep sleep without even completing your usual nighttime ablutions and remember nothing more until you're gently roused by a warm, wet mouth working your turgid member towards full tumescence.