Have Amy spend the night or send her home?

Amy can stay the night

"Actually, it might be quite nice to try something different with you 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, you're feeling quite tired after a very exciting day, so you ask her to get a blanket from the airing cupboard and sleep on the floor, so that she doesn't waken you by getting into bed after she's finished. She thanks you and kisses you on the cheek before you say goodnight and head upstairs to get ready for bed.

After completing your ablutions, you roll into bed and into a deep sleep as soon as your head hits the pillow. You remember nothing more until you're gently roused by a warm, wet mouth working your turgid member towards full tumescence.