Sans x frisk

Part:6

Sex Ed with her mother had been...unpleasant, to say the least.

Once Frisk had made it clear that she had no intention of leaving the Underground upon the Seal's breaking, Toriel happily set to work on once again creating a curriculum for her education. It was obvious that the compassionate goat woman hadn't given up hope that Frisk would one day return, and Frisk loved her so much for that.

For a few years, lesson time with her mother was Frisk's favorite part of the day. She loved the curling trails of written words that would arise from a few hours of note-taking. She loved perusing old history books to find out the monster's side of things, when in human school she had been fed biased information on how they were all evil.

Frisk really loved it when Toriel let one of her friends substitute for her when she was off busy with Queenly duties. Science and English with Alphys. Physical Education and History with Undyne. Cooking with Papyrus. Current Events with Mettaton, when he could be spared. Sans didn't give her lessons, but he sometimes came with Papyrus and snoozed on the couch ("Hey, kid. Your mom got any of that pie left in the fridge?" "SANS, DON'T BE RUDE!"). Frisk was aware that the other humans she had known back on the Surface hated school, but she adored absorbing knowledge.

Just not...sexual knowledge. None of her friends had volunteered to teach her that particular subject, when she had turned thirteen. Frisk didn't blame them. Toriel had done her best to make the subject as cringe-free as she could, but there were some things you just couldn't glaze over or create a euphemism for. It was awkward for Frisk, it was awkward for her mom...she didn't like to think about it. It was one of those things from her adolescence that she tried to pretend had never happened.

In light of her current situation, however, she wished she'd paid slightly closer attention. One thing that stuck with her now, though, was the lecture she had been given on human/monster relations.

"As you know, my little one, humans have fallen down into our midst in years past." Toriel had started. "And, unfortunately...there have been monsters who decided to take advantage of this." She paused to push her spectacles further up her nose. "Lashing out in anger and hatred, these monsters attacked the humans and forced a sexual relationship. From these incidents, our people have been able to gather how sex between humans and monsters works. Though our anatomical structures can resemble those of a human's, in terms of reproduction, we are completely incompatible. While humans are consistently composed of flesh and blood, monsters are primarily made of magic. In the same way that blood gives a human's body life, magic flows through us and gives us life. We are not chemically compatible when reproduction is concerned, though the act of intercourse for pleasure alone is, ah, possible.."

She looked up from the passage she had been reading to young Frisk, face flushed slightly under her well-kept white fur. "I'm sorry that I have to tell you all of this," she sighed. "But you must know. Having a lack of knowledge at the wrong time is just as lethal as power falling into the wrong hands. I want my little one to be safe." Toriel reached over and smoothed Frisk's hair gingerly. At thirteen and a half, Frisk hadn't felt that little. No thirteen-year-old thinks they are young. But of course, she had been. She was simply at the age where your mom calling you by terms of endearment was embarrassing, but still secretly okay. Then Toriel had asked her if she'd wanted to take a break from the lesson and make chocolate chip cookies, and who could say no to those?

Frisk was glad she had listened to the human/monster incompatibility bit. She wouldn't even know where to look to get contraception in the Underground, let alone a kind that worked for a human. Could she have resisted the pull of Sans had she known of consequences? ...Perhaps not.

She couldn't resist him now. Because now, he was tugging her along to the bed. Now, she was flat on her back, pulse hammering from nerves and thrill and wanting. He was panting as he moved to straddle her waist, his cock brushing her bare stomach. With the quick brush of flesh-on-magic came a light fluid that Sans had confessed to producing purposefully to be more accurate to the human experience. His attention to detail left her in awe.