What about Minamoto? (Psychic)
Oh I was a Minamoto team as well (and still is I guess) for similar reason. However, SSR-kun seems to be bolder than Minamoto, which makes their dynamic fits my very much personal taste more lol it's really just that.
I think if SSR-kun's sharp and unbothered enough, he'd be able to get around MC without alerting MC's yaoi-radar. Like "oh it's the weird guy again", MC is only thinking about using him to distract Hatano which make him pay less attention to SSR, but it'll be funny if his plan backfired and SSR become interested in him instead (cliche, I know). Of course, all of this is still in my head haha
Ssr kun just seems to be very chill overall lol MC might need someone who can let him rest like that