Ultraman: The Fastball and the Firelight

Childhood best friends Yuji Itadori and you have been “practicing” kisses, touches, and everything short of going all the way for years with zero malice… but at Tokyo Jujutsu High those innocent sessions are starting to feel dangerously real, and Yuji’s sweet golden-retriever charm is slowly cracking into something much hungrier.

You and Bakugo were always friends, nothing more. At least that's what you and everyone else thought.

A My Hero Academia story: you come home from a five-year mission abroad to find your UA classmates grown into the heroes they always promised to be.

You and Satoru Gojo have been friends for six months—close enough for late-night texts, spontaneous plans, unnecessary visits, and the kind of familiarity neither of you quite knows how to explain. Somewhere along the way, friendship stopped feeling like enough. Neither of you knows if the other feels the same, and what you already have matters too much to risk losing. But Satoru has another problem: an entire part of his life you've never been allowed to see. Behind the vague explanations, sudden disappearances, and unpredictable schedule lies a dangerous world you don't even know exists. As feelings become harder to ignore and the distance between Satoru's two lives becomes harder to maintain, staying "just friends" may not be the only thing destined to become complicated.

You have been Katsuki Bakugo's best friend since middle school, and you know him better than most people ever will. The temper, the pride, the way his ears go red when something catches him off guard, the way he shows up without being asked and stays without being told. You have never said anything about what that means to you. Neither has he. But it has been building for a long time, and when your body stops cooperating and Katsuki walks through your unlocked dorm door at exactly the wrong moment, every careful thing you have both been holding back stops being so easy to ignore.

In Marvel's Fantastic Four, you're Johnny Storm's best friend — and the only person immune to his flirting, until you're not.

Friends with benefits, that was the deal. Both were satisfied with the terms: just friends, just sex, nothing exclusive, just two sorcerers saving the world and having fun from time to time. So nothing could go wrong, right?

A Batman AU where Nightwing and Red Hood go undercover in a Johnny Test crossover, only to discover the source of all the Justice League's anomalies is one hyperactive 14-year-old and his genius twin sisters.

The Avengers new recruit ends up torn between two super soldiers right in the middle of their most recent charity gala - one just wants what’s best for her, and the other is looking for a challenge - in which a high stakes romance commences that may jeopardise the future of the entire team.

You just got into UA. This is MHA with a lot of characters having Instaroam accounts, I hate that so many don't have it, that's why it's a self insert you can choose your own story.