Sans could feel his magic starting to form without his permission. Frisk was on her knees, face down into his pillows working the dildo into herself. She had yet to notice him standing there, but then again she had her eyes closed. Sans should have walk away, teleported out of there, alerted her of his presence but instead he stood rooted to the spot watching as she shoved the dildo into her slit as fast as she could moaning into the pillow. He knew it was wrong to just stand there and watch but this had to be the reason she chose his room right.
Making his decision he took matters into his own hands and decided he would deal with the consequences later. Letting his magic free he took control of the dildo and pulled it out of her. Frisk gasped and whirled around to see sans standing not too far from the bed. He had a pretty lax smile on but his eyes were screaming lust. Frisk wasn't sure on what to say or do as this could go a million different way.
"That's some pretty frisky business you put to." sans purred. Before frisk could even think blue magic had her on her back leg spread wide. "You sure you don't need some help."
The dilldo ramed back into her without any warning her breath caught as she tried to keep rhythm with it. Sans watched as she moaned loud and arched off the bed trying to get it deeper.
Taking off his pants and tossing them he moved in between her legs getting a closer view. He groaned at how greedy her pussy was. Stopping his magic and pulling it out of her made she whine at loses before he summoned his tongue and went in for a taste. He smirked watching her twitch and shiver from a simple lick. He went for more pulling sweet sounds from her lips as he drove his tongue in deep . frisk was in heaven here she thought she would only get off with his scent and now she had him tonguing her to the high heavens. She moaned as the pool of pleasure was at it's peek. he felt as her walls clenched around his tongue, and begin to pick up the pace. When frisk came sans greedily lapped it all up.