Asriel and December were "dating" in the sense that they were now officially a thing and not a couple that people were shocked to learn weren't dating. That didn't change their dynamic any. Asriel just enjoyed being with December. He didn't feel a need to rush things faster than they were going. Even if he did, Asriel wasn't the most confident guy, so it's not like he would even really be able to push things. December, on the other hand, was more...
Unpredictable.
"Yooo, Azzy! I'm gonna get my shower!"
Asriel was surprised to hear this. December kind of just... did things. It was weird for her to tell him about tha-
"Hold on... you haven't gotten yours yet, have you? Wanna take one together?"
O-oh. Oh! That's... that's December asking if he wanted to take a shower with her. Angel above. She really did spring things on him, didn't she? It wasn't a bad thing. She knew he wasn't the... bravest, and December was always in his corner encouraging him, so he didn't feel too flustered. Nothing could go wrong here.
"I'd love that! Y-yeah! Gimme a minute!"
Asriel almost immediately spotted the haphazard pile of December's clothes strewn onto the floor as he walked towards the bathroom. He carefully removed his garments, placing them in a nice clean stack next to December's heap. He decided to help her out as well, making it look at least slightly more presentable and not like December was crashing through the bathroom door to get a shower.
As he walked in, the water was already running, and December seemed to mind her own business. Asriel simply walked right in, joining her.
As they began to clean themselves up after the day, Asriel couldn't help but think about what was happening. They were together... naked. That was a first for them. December was very casual about it, thankfully. She was just that sort of person. He knew his heart couldn't take it if it was treated like a big deal.
It was only then, of course, that Asriel spotted something else.
The smirk.
It was unmistakable. It was the definitive sign that she was plotting something. Basically every notable incident in their relationship, romantic or not, started with that look.
Asriel immediately looked at December, only to see her starting directly down at... him.
"Daaaamn... so that's what it looks like, dude! Not bad! It's pretty cute, although I should'a guessed it would be as cute as you..."
Cute? Cute? Was that a good or bad thing? He knew that Dess was at least aware of him... embracing his feminine side. Did she like that? Yeah, she winded up fighting for him a fair amount of the time, and he'd also heard jokes from everyone about Dess wearing the pants in the relationship at least once, bu-
"Yeah, not bad, fluffbuns... nice balls, too."
Ok, phew. It was over. This was a natural stopping point. Ok, it was o-
"Wait... Azzy... how does it feel to... you know... jerk off? Nononono, I'm serious, I wanna know. Maybe it's just, like, how you're reacting, but you don't really seem the sorta guy to think about this much... you can't be wasting this thing, dude. Your little guy here is basically built for shooting fucking ropes, and there's NO fucking way you don't spend at least like an hour a day doing that, right...?"
Asriel felt his head start to get blurry as Dess went on. He was unaccustomed to even basic conversations surrounding this... topic, and surely not Dess outright complimenting his member. She was giving him way too much attention, and it started to show. He felt blood rushing to his crotch right as he realized what was happening. He could only brace for what Dess could say.
"Waitwaitwait... dude... you're not..."
Dess practically exploded in laughter.
"Noooo waaaay! You're actually getting hard from this? You like this? Dude, you should'a told me earlier!"
December watched Asriel's dick grow like a child at a fair watching their balloon inflate. Asriel was totally speechless.
"Daaaamn, you got some fucking meat on you, Azzy! You get to jerk that shit off? Save some for me, asshole!"
Asriel was begging for that to be it. For it to be over. But she just couldn't leave it there. He knew who she was talking to.
Dess went down.
Ok. This was happening. December Holiday was about to suck him off in the shower. Asriel tried to mentally count how long he could last - 30 seconds? 15 seconds? Oh god. He was about to humiliate himself. It was the first time they'd done anything sexual, and Asriel was about to immediately pump his cum all over Dess. It was painfully apparent how absolutely pathetic that was. He knew Dess understood how close he was to finishing. She was just going for the kill. He didn't want their first time to be like this. Not at all. Oh nonononon-
"Hey Azzy, you alright?"
"I...I... y-yeah, ahaha..."
"You look sad, man. What happened?"
"W-well... I..."
December hugged him. Asriel melted into her arms.
"Hey man... heyheyhey... don't cry...! Azzy... fuck..."
He's crying. Of course he is.
He failed. Obviously. He fucked up the one thing people their age are supposed to be good at - fucking. He can't even do that correc-
"Hey, stay with me, ok? No running around in your head. Azzy... fuck, man, I didn't... I didn't know you..."
December pauses for a second.
"I'm sorry I got you overwhelmed, man. I don't expect you to feel ready for that shit now, or tomorrow, or whatever day it is... you just take all the time you need, alright? I know I was teasing you, but you're fucking beautiful, man. I mean that. I literally cannot help but look at you when I walk in the room. I don't care if you struggle with being sad or scared or whatever bullshit your mind comes up with. I will always be with you. I really do not give a shit if I can tease you until you jizz yourself if you don't want to be there."
...
"And yeah, your dick looks good. I'm not taking that back."
...
"O-oh... December..."
"Come here, big guy. We're gonna get cleaned up, and we're gonna enjoy a nice meal together, and we're gonna hang out for the rest of the night. How about that? I think someone needs a little TLC..."
I... I love you, December...
"Hey, there you go! I love you too, man!"