https://www.doujinshi.org/book/1002243/
There's really not enough Noctis x Prompto doujinshi uploaded so far so here's this.

That blond dude has lovely boobs! And that blush on her face, so cute! Great upload, whatever your preference is, if you know what I mean.

Base +26, daniels1989 -9, shadowkazumanic +6

@DJNoni
Yup. You are right about everything you just said.

Base +17

Prompto kept a little of that adolescent chubbiness he had in Brotherhood.

Base +6, HonorableShogun +7

"Anyway, the happy town snuggle club invade our homeland and Noctis must journey around the world, building his powers until he can take the fight to them alongside his three constant companions: Gladiolus, a beefy mullethead who was doing crunches when everyone else was learning how to do up shirt buttons; Ignis, the smart one who looks like Travis Touchdown's more successful cousin who'll always sarcastically ask him if he's gotten a real job yet at family get-togethers; and Prompto, a 14-year-old girl in a miniskirt who's probably only here because the other three needed something warm to park their todgers in on wintery nights."

Base +24, HonorableShogun +7, Celletack +2, shadowkazumanic +6

TBH the animation on pixiv is better than the doujin.
https://www.pixiv.net/member_illust.php?mode=medium&illust_id=61541114

Base +8, HonorableShogun +8