Undertail (lemon and a lot of it)

Sans x female! Frisk (classic)

It has been 12 years since monsters have been freed. Frisk has been doing her best as the ambassador and things have been really calming down. Sure, some humans still hated monsters but it wasn't as bad and a lot of humans coped with monsters. Though this didn't make it any easier for frisk. In fact it made things harder. Since now they were integrating schools and other things like that. Angry parents, some assassination attempts. It was getting hard and it really started to stress Frisk out as she had to deal with it all.

She came into her house. Well it really wasn't hers since she didn't like living alone. So she moved in with the skeleton brothers. She let out a long heavy sigh as she came in. She was stressed from the days work. She walked to the coach after setting her bag and taking her shoes off. She had set that rule to keep the house cleaner. Since papyrus was busy going off doing what ever and sans was too lazy. It was up to her to keep the house clean and cook most of the time. Papyrus was still learning so she couldn't depend on him.

"Heh, you look 'bone' tired." That joking voice once more. It was like music to Frisk's ears really. Since for one, he could always make her giggle. And two Frisk had a crush on sans. It only recently came up since she had noticed all of his features. It was weird to think a skeleton was hot wasn't it? There wasn't anything there to begin with. So even if he did accept her feelings there was nothing to.... Get it on with? She didn't like that thought though it still would be interesting trying it at least.

"Uhh. Kiddo?" Sans said snapping Frisk out of her little trance. Frisk yelped slightly and she bolted up. Her face becoming hot and red with embarrassment. What was she thinking? He was a friend. A good childhood friend that was there for her.

"Y-yeah sans?" Frisk cursed herself for stuttering at that. Like it wasn't embarrassing and awkward enough.

"So. You think I'm hot huh?" Sans grin seemed to get wider and he chuckled. His signature. But what horrified Frisk the most was he heard that? How much did he hear? And she was talking out loud the whole time wasn't she.... She blushed even darker, some of it even traveled to her neck and ears.

"Oh my god sans! I am so sorry! I-i didn't mean to say it o-or even think it! I-it just kinda came o-out!" Frisk said as she quickly tried to defend herself for what ever may happen.

"Heh, tis' alright kiddo. Though I shouldn't be using that nickname anymore should I?" Sans said before he gently took Frisk's wrist and he snapped his fingers. Everything turned black before color reappeared. Frisk fell onto Sans' bed. How did they get here? He must have used one of his short cuts right? Frisk looked up at sans in utter shock.

"Well the feeling is mutual. You have been growing up which is kinda hard for me to keep my bone-zone in check sometimes. Something about jiggling flesh sends me up a wall." Sans said before slowly taking off his jacket. "I have been seeing you stressed out lately. And you have been doing the same to me. So why don't we help each other out a bit. By releasing some of the stress?" He says before looking at frisk for approval. 

Frisk was blushing darkly and speechless. She gulped and nodded. Well it was now or never really. And she would get to find out for herself if it could happen. She was kneeling down on the bed now. Her knees together with her hands stuffed between her thighs. She did this pose whenever she got nervous about something. And this was one of those things.

Sans got a bit closer and he hesitantly leaned in. His teeth pressed against Frisk's soft lips. This earned a little giggle from frisk. Since it was like he was pressing his face to hers. This earned a bit of a growl from sans. He felt like he was being teased. He didn't take kindly to that. But his grin grew as he got an idea. He uses his magic to form somewhat of a solid tongue. He opens his teeth to let his tongue glide along Frisk's bottom lip.